WO2012171387A1

WO2012171387A1 - Method, system, and device for acquiring and feeding back channel information

Info

Publication number: WO2012171387A1
Application number: PCT/CN2012/073064
Authority: WO
Inventors: 张然然; 拉盖施; 高秋彬; 苏昕; 彭莹; 孙韶辉
Original assignee: 电信科学技术研究院
Priority date: 2011-06-17
Filing date: 2012-03-26
Publication date: 2012-12-20
Also published as: CN102201849A; CN102201849B

Abstract

The present application relates to communication technology. Disclosed are a method, system, and device for acquiring and feeding back channel information. When multiple transmission points have not performed an antenna calibration, a small amount of channel information is fed back by a receiver end, while at the same time, a combined channel of the multiple transmission points is determined by using channel reciprocity and the channel information received. Because the reciprocal relationship between a downlink channel and an uplink channel of each transmission point is determined on the basis of the information fed back, then the downlink channel is determined on the basis of the reciprocal relationship, the accuracy of the downlink channel acquired by a transmitter end is thus improved.

Description

Method, system and device for acquiring and feeding channel information The present application claims to be submitted to the Chinese Patent Office on June 17, 2011, the application number is 201110164364.X, and the invention name is "a channel information acquisition and feedback method, system and device" The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference.

Technical field

The present invention relates to communication technologies, and in particular, to a channel information acquisition and feedback method, system and device. Background technique

The Long Term Evolution Advanced (LTE-A) uses the same-frequency networking. When the spectrum utilization rate is greatly improved, the user signal at the cell edge will be seriously degraded, and at the same time, it will be higher from other cells. If you do not deal with signal fading and interference problems, it will seriously affect the experience of marginal users. Coordinated Multi-Point Transmission/Reception (CoMP) technology can not only improve signal shielding but also reduce inter-cell interference by introducing information interaction and joint transmission between multiple cells. Greatly improve the data transmission performance of users at the edge of the cell.

In order to increase coverage of hotspots and save network costs, many operators and equipment vendors want to introduce distributed remote radio heads (RRHs). The RRHs are dispersed in a cell. An RRH can have its own independent cell identifier (Identification, ID). It can also belong to the same 'J, zone' as other RRHs or macro base stations. Since the distance from the end user is small, the terminal can be provided with a communication service with a high shield. Since the data of all RRHs in a cell are processed centrally by the baseband processing unit, this brings about the possibility of efficient cooperation between RRHs. Therefore, distributed RRH is also an important scenario for CoMP technology applications.

Whether it is a cell in a multi-cell or an RRH in a distributed RRH scenario, it can be regarded as

A transmission point in a CoMP transmission. To achieve joint processing of CoMP transmissions, it is necessary to know the joint channel of each coordinated transmission point to the user.

In a Time Division Duplex (TDD) system, an uplink channel can be measured by a Sounding Reference Signal (SRS), and a channel can be obtained by using channel reciprocity. This not only saves feedback overhead on the downlink channel, but also avoids quantization and feedback errors in the feedback process.

Specifically, in the case where the antennas are ideally calibrated in each transmission point of the TDD system and the ideal antenna is calibrated between the transmission points, the base station side can use the channel reciprocity and obtain the downlink channel information through the uplink SRS measurement.

As shown in Figure 1, to achieve CoMP transmission of transmission point 1 and transmission point 2, it is necessary to know the transmission point 1 and the transmission point.

2 to the user's joint channel [ ^Η ^]. If the antennas in each transmission point have been calibrated, the pilot is measured by the uplink. There is only one complex difference between the obtained transmission point 1 and the uplink channel H and the downlink channel ^用户 between the users, and the modulus is approximately 1 . Similarly, the uplink channel and the downlink between the transmission point 2 and the user obtained by the uplink measurement pilot are obtained. There is only one complex difference between the channels, which is approximately 1 modulo, that is, " = ^^, " ₂ 3⁄4^ = H ; if the ideal antenna calibration is also achieved between the transmission points, then = « ₂ = « , then the uplink Measurement of the resulting joint channel [ ^H and downlink joint factory ^DL 1 plant ^UL ~1 _ ^ plant ^DL 1

There is only one complex difference in the channel L ^Hi ", ie: L ^H ' ” = «L ^H ' H ₂ ”. At this time, the channel reciprocity is established, and even if α is unknown, the downlink joint channel can be obtained by the uplink measurement.

However, if the antennas of the transmitting circuit and the receiving circuit are not calibrated, the mismatch of the transmitting and receiving circuits will result in the reciprocity of the uplink and downlink channels not strictly established. As a result, the downlink channel estimation is inaccurate.

In the actual system, the calibration between the antennas in each transmission point can be achieved by self-calibration, etc., and the antenna calibration between the transmission points requires signaling interaction and/or standardization. Currently, the antenna calibration between transmission points cannot be supported. , then. If the joint channel of the uplink measurement is directly used to estimate the downlink joint channel [Hi ¹ " ^H "],

^{^{[H 'LH "] = [}} " i H i L ¾ Η "], the channel reciprocity is not established, without considering the difference between the _[alpha], will result in an error estimate channel information, thus affecting the performance of CoMP SUMMARY OF THE INVENTION

The embodiment of the invention provides a method, a system and a device for acquiring and feeding channel information, so as to improve the accuracy of the downlink channel acquired by the transmitting end.

A channel information acquisition method includes:

Obtaining channel parameters of the uplink channel from the receiving end to each transmission point, and determining an uplink channel matrix from the receiving end to each transmission point;

Determining a joint downlink channel matrix of each transmission point according to an uplink channel matrix of each transmission point and a determined reciprocal relationship between the downlink channel and the uplink channel of each transmission point, between the downlink channel and the uplink channel of each transmission point The reciprocal relationship is determined according to the uplink channel parameters of each transmission point and the downlink channel information fed back by the receiving end.

A channel information feedback method includes:

Determining a downlink channel matrix or a joint downlink channel matrix of each transmission point;

And downlink channel information is fed back according to the downlink channel matrix or the joint downlink channel matrix of each transmission point. A channel information acquiring apparatus includes:

Obtaining a unit, configured to obtain channel parameters of an uplink channel of the receiving end to each transmission point, and determine an uplink channel matrix of the receiving end to each transmission point;

a channel information acquiring unit, configured to: according to an uplink channel matrix of each transmission point and the determined each transmission point a reciprocal relationship between the row channel and the uplink channel, determining a joint downlink channel matrix of each transmission point, and a reciprocal relationship between the downlink channel and the uplink channel of each transmission point according to an uplink channel parameter and a receiving end of each transmission point The feedback downlink channel information is determined.

A channel information feedback device includes:

a determining unit, configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point;

And a feedback unit, configured to feed back downlink channel information according to the downlink channel matrix or the joint downlink channel matrix of each transmission point.

The invention provides a channel information acquisition and feedback method, system and device. When no antenna calibration is performed between multiple transmission points, a small amount of channel information is fed back by the receiving end, and the channel reciprocity and the received The channel information determines a joint channel of the plurality of transmission points, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the feedback information, and the downlink channel is determined according to the reciprocity relationship, thereby improving The accuracy of the downlink channel acquired by the sender. DRAWINGS

1 is a schematic diagram of a multiple transmission point channel in an embodiment of the present invention;

2 is a flowchart of a method for acquiring channel information according to an embodiment of the present invention;

FIG. 3 is a flowchart of a channel information feedback method according to an embodiment of the present invention;

4 is a schematic structural diagram of a channel information acquiring system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a channel information acquiring apparatus according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a channel information feedback apparatus according to an embodiment of the present invention. Detailed ways

The invention provides a channel information acquisition and feedback method, system and device. When no antenna calibration is performed between multiple transmission points, a small amount of channel information is fed back by the receiving end, and the channel reciprocity and the received The channel information determines a joint channel of the plurality of transmission points, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the feedback information, and the downlink channel is determined according to the reciprocity relationship, thereby improving The accuracy of the downlink channel acquired by the sender.

As shown in FIG. 2, the method for acquiring channel information provided by the embodiment of the present invention includes:

Step S201: Determine, according to the obtained channel parameter of the uplink channel of the receiving end to each transmission point, an uplink channel matrix of the receiving end to each transmission point;

Step S202: Determine, according to a reciprocal relationship between the uplink channel matrix of each transmission point and the determined downlink channel and the uplink channel of each transmission point, a joint downlink channel matrix of each transmission point, where the downlink channel and the uplink of each transmission point The reciprocal relationship between channels is based on the uplink channel parameters of each transmission point and the downlink channel fed back by the receiving end. Information is determined.

Since only a small amount of downlink channel information of the reciprocal relationship between the downlink channel and the uplink channel of each transmission point can be determined by the receiving end feedback, the system does not impose an excessive burden on the system, and at the same time, the downlink channel is known The reciprocal relationship between the uplink channels can determine the joint downlink channel matrix of each transmission point according to the uplink channel matrix and the reciprocity relationship of each transmission point, so the accuracy of the downlink channel acquired by the transmitting end is improved.

In the case that the reciprocal relationship between the downlink channel and the uplink channel is known, since the reciprocal relationship between the downlink channel and the uplink channel changes little, the device performing channel acquisition may be based on the already identified downlink channel and A reciprocal relationship between the upstream channels and an uplink channel matrix of each transmission point to determine a joint downlink channel matrix for each transmission point.

Generally, the device for performing channel information acquisition may be one of the transmission points, that is, a preset central transmission point, or may be another node such as an evolved base station (e-NodeB, e B ), as long as the node and each transmission point are between It is more convenient to carry out data interaction.

The device for performing channel information acquisition, that is, the transmitting end needs to first determine the downlink channel information fed back by the receiving end and the uplink channel matrix or each transmission of each transmission point before determining the reciprocal relationship between the downlink channel and the uplink channel of each transmission point. The joint uplink channel matrix of the points, and then the joint downlink channel matrix of each transmission point is determined according to the uplink channel matrix of each transmission point and the reciprocal relationship.

Specifically, when the channel information acquiring device is a preset central transmission point, the preset central transmission point needs to determine the downlink channel information fed back by the receiving end, and the uplink channel matrix of each transmission point or the joint uplink of each transmission point. Channel matrix. The uplink channel matrix of each transmission point or the joint uplink channel matrix of each transmission point may be sent by the other transmission points to the preset central transmission point, and the downlink channel information fed back by the receiving end may be All the downlink channel information is directly fed back to the preset central transmission point by the receiving end, and the downlink channel information corresponding to each transmission point is respectively fed back to the preset central transmission point and other transmission points by the receiving end. After receiving the downlink channel information fed back by the receiving end, the other transmission point forwards the downlink channel information fed back by the receiving end to a preset central transmission point.

When the channel information acquiring device is a preset non-transmission point node, the preset non-transmission point node needs to determine the downlink channel information fed back by the receiving end and the uplink channel matrix of each transmission point or the joint uplink channel of each transmission point. matrix. The uplink channel matrix of each transmission point or the joint uplink channel matrix of each transmission point may be sent by each transmission point to the preset non-transmission point node, and the downlink channel information fed back by the receiving end may be All the downlink channel information is directly fed back to a transmission point by the receiving end, and then forwarded to the preset non-transmission point node by the transmission point, or the receiving end may respectively feed back the downlink channel information corresponding to each transmission point to multiple Transmission point, after receiving the downlink channel information fed back by the receiving end, the transmission point feedbacks the downlink of the receiving end The channel information is forwarded to a preset non-transmission point node. Of course, if allowed, all the downlink channel information can be directly fed back to the preset non-transmission point node by the receiving end.

When the receiving end feeds back the downlink channel information, it can actively perform feedback at the timing, or can perform feedback under the trigger of the transmitting end.

The downlink channel information fed back by the receiving end may be such that the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel, and may be at least one element in the downlink channel matrix corresponding to the corresponding transmission point determined by each transmission point, Or at least one channel ratio determined corresponding to each transmission point except the set transmission point, where the channel ratio determined by the corresponding one of the transmission points is: the setting element in the downlink channel matrix of the transmission point is not The transmission point directly or indirectly determines the ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship, and may also feed back the channel ratio corresponding to the transmission point for the part of the transmission point, and feed back the downlink channel matrix of the transmission point for other transmission points. At least one element in .

Specifically, when the receiving end feeds back at least one element in the downlink channel matrix corresponding to the corresponding transmission point determined by each transmission point, the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel by using the at least N elements.

Assume that the receiving end has ^NR receiving antennas, and the joint channel of N transmission points needs to be measured. The nth transmission point has ^Ν τ "root transmission day, then the receiving end can measure the downlink joint channel according to the downlink pilot, and downlink. Joint channel can be expressed as

Dimension complex matrix H ^D

H ^DL = a ^L ... ]. Where, " = 1, '''^ is ^ "dimensional complex matrix, which is the downlink channel matrix of the _nth transmission point to the receiving end. C = 1.., NJ = 1.., _NrJ = 1,... Indicates the jth column element of the first row of ΗΓ. The transmitting end uses the uplink pilot to measure the uplink channel from the receiving end to each transmission point, which is expressed as

H " = 1, ''', N , is ^ <"dimensional complex matrix, IC " = UJ = U _R J = 1 --, N; , the element of the jth column of the first row. Because of the antennas in the transmission point The calibration has been completed, and the following relationship is satisfied between the downlink channel ^H and the uplink channel L:

= α _η Ή^, η = \,·-,Ν . where "" is a complex number and is a constant. Since the antenna calibration between transmission points is not completed, when η takes different values,

«„,"=1,'", the elements in W are not equal. Therefore, the joint downlink channel matrix cannot be directly obtained from the uplink channel matrix. Therefore, as long as the downlink channel information fed back by the receiver can make the sender know that ^a "' ^{n =} u The proportional relationship between the elements can be determined, that is, the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined, and thus a ₂

The terminal can determine the joint downlink channel according to the determination. If the receiving end feeds back at least one element for each downlink channel matrix, " = U , when the feedback is at least one channel element, the transmitting end can determine: a H ^DL =

Where m is an arbitrary integer from 1 to N, that is, the reciprocal relationship between each uplink channel matrix and the 2 3⁄4 downlink channel matrix is determined by using the uplink channel matrix of the mth transmission point and the downlink channel matrix as a ratio reference.

When m is 1, that is, when the first transmission point 1⁄2 D is used as the reference, the transmitting end can determine:

DL h!V h. UL

Η

Since 'k is a constant, the coefficient of the joint downlink channel matrix does not affect the characteristics of the joint downlink channel determined by the transmitting end.

When the receiving end feeds back at least one channel ratio determined by each transmission point except the set transmission point, the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel by using each channel ratio.

By the same token, as long as the downlink channel information fed back by the receiver can make the sender know, " = 1,..., w each element

H H

The proportional relationship between them can be, so that the sender can be based on

Determine the joint downlink channel.

If the receiving end determines at least one channel ratio corresponding to each transmission point except the set transmission point and feeds back, the total feedback is at least N-1 channel ratios, and the channel ratio fed back by the transmitting end is: δη , and "_≠;

_{Wherein, k m ft '' d,} / ∞ {i, '",N;}, the value of each transmission point value ^ ^z" values are set in advance, usually, for convenience of calculation, it is necessary to be m Pre-set, if the m value is not set, when selecting the m value, it is necessary to make m a transmission point number that does not directly or indirectly determine the ratio relationship with the transmission point n to ensure the validity of the feedback channel ratio.

For example, if there are 4 transmission points and the channel ratio of the first transmission point is determined, the third transmission point is used to establish a ratio relationship, where n=l, m=3, and the channel ratio of the second transmission point is determined. When using the first transmission point to establish The ratio relationship, n=2, m=l at this time, when determining the channel ratio of the three transmission points, since the ratio relationship between the first transmission point and the third transmission point has been determined, the first one is no longer used. The transmission point establishes a ratio relationship, and since the ratio of the channel between the second transmission point and the third transmission point can be determined according to the channel ratio of the first transmission point and the channel ratio of the second transmission point, it is no longer Use the second transmission point to establish the ratio relationship, that is, when n=3, m≠l, m ≠2.

Since = «„H ," = l,"',N, so you can determine:

UL,n

H h DL,

h UL,mah ^DL ' ^m a. If m is a fixed value, then n takes values other than m in 1~N, which can be obtained by this formula.

D

The value determines the reciprocal relationship between the downlink channel and the uplink channel.

When the m value is a preset fixed value, the joint downlink channel matrix of each transmission point can be determined according to the following formula:

DL

H

i UL, mi UL, m UL, ma H ^DL = H: H;

h ^UL ' h ^UL ' ^N where Η is the uplink channel matrix of the nth transmission point, which is a constant, indicating the difference between the uplink and downlink channels of the mth transmission point.

Specifically, when m is set to 1, the channel ratio that is fed back is: δ =

h DL,1 n = 2,···,Ν h Κλ,

UL,1 δ ,n = 2 --- N

In turn, you can determine: U , 1

So you can get:

;

The downlink channel can be obtained by using the uplink channel as follows:

Of course, the receiving end can also feed back the channel ratio for some transmission points, and feed back the elements in the downlink channel matrix for another part of the transmission point. In short, the feedback information can enable the transmitting end to obtain ""," ⁼¹ , '", two in W The ratio between them, you can follow The following equation uses the uplink channel matrix to obtain a joint downlink channel matrix:

As long as the downlink channel information that is fed back is sufficient and effective, a person skilled in the art can obtain, by mathematical calculation, the channel ratio and/or the elements in the downlink channel matrix by using the method provided by the embodiment of the present invention. The ratio between the two determines the joint downlink channel matrix.

For example, the feedback downlink channel information includes at least one element in the downlink channel matrix of the corresponding transmission point and/or a set channel in the downlink channel matrix of the corresponding transmission point and a downlink channel matrix in the non-set transmission point. When setting the ratio of elements, the joint downlink channel matrix of each transmission point can be determined as follows:

First determining, according to at least one element in the downlink channel matrix of the corresponding transmission point and/or according to a ratio of a setting element in a downlink channel matrix of each corresponding transmission point to a setting element in a downlink channel matrix of the non-set transmission point. The channel ratio of each transmission point to the set transmission point:

Πί;

In this way, by adding the channel ratio directly fed back by the receiving end, the transmitting end knows at least N-1 effective channel ratios, and the joint downlink channel matrix H ^{DL of} each transmission point can be determined according to the following formula:

i UL i UL i UL

a H ^DL km m ⁿ k _mm jjUL J _M

K-[ -[ JJ where N is the number of transmission points, Η is the N _R XN ^ dimension upstream channel matrix from the receiving end to the nth transmission point, N _R is the number of antennas at the receiving end, Λ^ is N transmission points The number of antennas at the _nth transmission point, indicating the 1st column element of the kth row in the downlink channel matrix ^H ", 13⁄4 and ι _η are preset values, and k _n e {i, —, N _B } , ι _η {1,···,Λ^} , _m is the number of the set transmission point, and _m {l, ..., Ν}, which is a constant, indicating the difference between the upstream and downstream channels of the mth transmission point. .

For the channel feedback processed by the single-cell receiver, the channel information acquisition method provided by the embodiment of the present invention may also be used. For example, the transmission point 1 is the serving cell of the user, and the receiving matrix of the user is calculated as the dimension matrix based on the downlink channel ^H.

, where L is the number of data streams, (·)" means conjugate transposition, and the downlink equivalent channel is:

3⁄4 ^{= U} i ^Η , H _eq _LH _{e 1} H _e3⁄42 - H _{e N} ”, H _e „," ₌ l, '", N is the downlink equivalent channel of each cell; The row channel ^^ calculates that the receiving matrix of the user is a dimensional matrix, and the equivalent channel obtained by the uplink channel is

^Η _3⁄4 ^{= U} ' ^Η , _q _ LH ₁ H _e3⁄42 ... H _N ”, H „,” ₌ 1, '", N is the uplink equivalent channel of each cell. Then the upper and lower equivalent channels satisfy: ^H = ^H , " ^{= 1} , ''', W. Therefore, after the reciprocal relationship between the uplink and downlink equivalent channels is known, the downlink equivalent channel matrix can be determined by the reciprocal relationship between the uplink equivalent channel matrix and the uplink and downlink equivalent channels. At the receiving end, the feedback element value / 3⁄4 / " or the feedback channel ratio ^ = ^ « = 1, ..., N and W≠, where

"'" Z

The k _n and l _n are all pre-set, and the setting elements of each transmission point are also set at the transmitting end, so that when the terminal feeds back the element value or the channel ratio of the corresponding transmission point, only the sequential feedback A set of values is sufficient, and no feedback is needed for k _n and l _n , where ^ and ^ can be set by standard or by higher layer signaling.

When receiving the feedback element value or the feedback channel ratio, the receiving end may quantize the element value or the channel ratio, and feedback the quantized value to facilitate feedback on the channel information, and further reduce the burden on the system caused by the feedback channel information. .

Of course, for each transmission point, the receiving end feeds back at least one element value, that is, feedbacks at least N element values, or for other transmission points except the set transmission point, the receiving end feeds back at least one channel ratio, that is, feedback at least N- 1 channel ratio. When the receiving end only feeds back N element values or N-1 channel ratios, the reciprocal relationship between the downlink channel and the uplink channel can be determined. If the system conditions permit, the receiving end can have more By feeding back several element values or channel ratios, the transmitting end can more accurately determine the reciprocal relationship between the downlink channel and the uplink channel, thereby further improving the accuracy of the downlink channel acquired by the transmitting end.

The embodiment of the present invention further provides a channel information feedback method, as shown in FIG. 3, including:

Step S301: Determine a downlink channel matrix or a joint downlink channel matrix of each transmission point.

Step S302: Feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point. In step S301, the receiving end may obtain a downlink channel matrix of each transmission point or a joint downlink channel matrix by using downlink pilots.

The receiving end can actively feed back the downlink channel information, and can also feed back the downlink channel information after being triggered by the transmitting end, thereby further reducing the feedback amount of the receiving end and reducing the burden on the system.

The receiving end may feed back the feedback downlink channel information to a preset central transmission point, or may feed back the downlink channel information corresponding to each transmission point to each transmission point respectively, when the channel is performed by a preset non-transmission point node. When the information is acquired, the receiving end may directly feed back the feedback downlink channel information to a preset non-transmission point node. Therefore, in step S302, the downlink channel information is fed back to the transmission point, specifically:

Feedback downlink channel information to a preset central transmission point; or Feeding back downlink channel information corresponding to the transmission point to each transmission point; or

The downlink channel information is fed back to a preset non-transmission point node.

The receiving end feeds back the downlink channel information to the receiving end, and may feed back to the transmission point, corresponding to each transmission point, the determined at least one channel ratio and/or at least one element in the downlink channel matrix corresponding to the transmission point, or may be a transmission The point feedback corresponds to each of the transmission points except the set transmission point, and the determined at least one channel ratio, wherein the channel ratio determined by the corresponding one of the transmission points is: the setting element in the downlink channel matrix of the transmission point is not The transmission point directly or indirectly determines the ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship.

That is, the receiving end may feed back to the transmission point at least one element in the downlink channel matrix corresponding to each transmission point, that is, at least N element values, or may feed back each transmission point except the set transmission point, and determine at least A channel ratio, that is, at least N-1 channel ratios. Of course, it is also possible to feed back at least one element of the downlink channel matrix to a part of the transmission points, and feedback at least one channel ratio to another part of the transmission points. At this time, at least feedback is also required. N values.

Specifically, the channel ratio that is fed back is specifically: = 1, -, Ν, and "≠ W;

Wherein, N is a number of transmission points "represents k _n row downlink channel matrix ^H 1 of" column element, k _n, and l _n is a predetermined value, and _{k n {1, -, N} B} _{, l n 6 {1, ·} · ·, ^}, η for the first _η transmission point N _R xN ^ dimensional downlink channel matrix receiving end, N _R is the number of antennas of the receiving end, Λ ^ is Ν transmission point of _The number of antennas of _n transmission points, m is a preset value, and m { l , ... , Ν} ο

Based on the same inventive concept, the embodiment of the present invention further provides a channel information acquiring apparatus, a channel information feedback apparatus, and a channel information acquiring system in a channel information acquiring system, and the principle of solving the problem and the channel information acquiring method by the devices The channel information feedback is similar, so the implementation of these devices can be referred to the implementation of the method, and the repeated description will not be repeated.

The embodiment of the present invention further provides a channel information acquiring system, as shown in FIG. 4, including:

The receiving end 401 is configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point, and feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point.

The central node 402 is configured to obtain channel parameters of the uplink channel of the receiving end to each transmission point, determine an uplink channel matrix of the receiving end to each transmission point, and determine an uplink channel matrix of each transmission point and a determined downlink channel of each transmission point. Determining the reciprocal relationship between the uplink channels, determining a joint downlink channel matrix of each transmission point, wherein the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is based on the uplink channel parameters of each transmission point and the downlink feedback of the receiving end Channel information is determined. When the central node 402 needs to update the reciprocal relationship between the downlink channel and the uplink channel of each transmission point, the central node 402 is further configured to obtain downlink channel information fed back by the receiving end, and according to uplink channel parameters and reception of each transmission point. The downlink channel information fed back is used to determine a reciprocal relationship between the downlink channel and the uplink channel of each transmission point.

The central node 402 can be specifically:

A preset central transmission point or a preset non-transmission point node.

When the central node 402 is a preset central transmission point, the preset central transmission point is further configured to: receive channel parameters of an uplink channel sent by other transmission points, and determine an uplink channel matrix of each transmission point; The other transmission points are also used to send the channel parameters of the uplink channel to a preset transmission point.

When the receiving end feeds back the downlink channel information to the transmission point, the downlink channel information corresponding to each transmission point is respectively fed back to each transmission point, and the preset central transmission point is further used for: receiving the receiving end feedback sent by other transmission points. Downstream channel information; At this time, other transmission points are further used to: after receiving the downlink channel information fed back by the receiving end, forward the downlink channel information fed back by the receiving end to a preset transmission point. Thereby, the downlink channel information fed back by the receiving end is concentrated into a preset central transmission point, and the joint downlink channel matrix of each transmission point is determined by a preset central transmission point.

When the central node 402 is specifically a preset non-transmission point node, and the uplink channel matrix of each transmission point is not set in a preset non-transmission point node, the preset non-transmission point node is further used for:

The channel parameters of the uplink channel sent by each transmission point are received, and the uplink channel matrix of each transmission point is determined. At this time, each transmission point is used to send the channel parameter of the uplink channel to a preset non-transmission point node.

If the receiving end does not directly feed back the downlink channel information to the preset non-transmission point node, but feeds back to the transmission point, the transmission channel that receives the downlink channel information needs to forward the downlink channel information to the preset non-set The transmission point node, at this time, the preset non-transport point node is also used for:

Receiving downlink channel information fed back by the receiving end sent by each transmission point;

The transmission point is further configured to: after receiving the downlink channel information fed back by the receiving end, forward the downlink channel information fed back by the receiving end to the preset non-transmission point node.

The embodiment of the present invention further provides a channel information acquiring device, which may be specifically a preset central transmission point, or a preset non-transmission point node such as a base station. As shown in FIG. 5, the device includes:

The obtaining unit 501 is configured to obtain channel parameters of an uplink channel of the receiving end to each transmission point, and determine an uplink channel matrix of the receiving end to each transmission point;

The channel information acquiring unit 502 is configured to determine a joint downlink channel matrix of each transmission point according to an uplink channel matrix of each transmission point and a determined reciprocal relationship between the downlink channel and the uplink channel of each transmission point, where each transmission point The reciprocal relationship between the downlink channel and the uplink channel is based on the uplink channel parameters and reception of each transmission point. The downlink channel information of the end feedback is determined.

When the channel information acquiring device is required to update the reciprocal relationship between the downlink channel and the uplink channel of each transmission point, the obtaining unit 501 is further configured to:

The downlink channel information fed back by the receiving end is obtained, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the uplink channel parameter of each transmission point and the downlink channel information fed back by the receiving end.

When the device is specifically a preset central transmission point, the obtaining unit 501 is specifically configured to:

The channel parameters of the uplink channel sent by other transmission points are received, and the uplink channel matrix of the receiving end to each transmission point is determined.

When the receiving end feeds back the downlink channel information to the transmission point, the downlink channel information corresponding to each transmission point is respectively fed back to each transmission point. In the preset central transmission point, the obtaining unit 501 is further configured to:

Receiving downlink channel information fed back by the receiving end sent by other transmission points.

When the device is specifically a preset non-transport point node, the obtaining unit 501 is specifically configured to:

The channel parameters of the uplink channel transmitted by each transmission point are received, and the uplink channel matrix of each receiving end to the transmission point is determined.

When the receiving end feeds back the downlink channel information to the transmission point, the downlink channel information is fed back to the transmission point instead of being fed back to the preset non-transmission point node. At this time, in the preset non-transmission point node, the obtaining unit The 501 is further configured to: receive downlink channel information fed back by the receiving end sent by each transmission point.

The embodiment of the present invention further provides a channel information feedback device, which may be specifically a receiving end such as a user terminal, or may be another receiving end node. As shown in FIG. 6, the device includes:

The determining unit 601 is configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point. The feedback unit 602 is configured to feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. A processor that can provide these computer program instructions to a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device To generate a machine that causes instructions executed by a processor of a computer or other programmable data processing device to generate functions for implementing a process in a flow or a flow and/or a block diagram in a block or blocks. s installation.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for acquiring channel information, comprising:

Determining an uplink channel matrix of the receiving end to each transmission point according to the obtained channel parameters of the uplink channel of the receiving end to each transmission point;

2. The method according to claim 1, wherein before determining the joint downlink channel matrix of each transmission point, the method further comprises:

The method according to claim 1 or 2, wherein the downlink channel information fed back by the receiving end specifically includes:

Corresponding to at least one channel ratio determined by each transmission point and/or at least one element in a downlink channel matrix corresponding to the transmission point, the channel ratio determined by the corresponding one transmission point is: a setting in a downlink channel matrix of the transmission point a ratio of a fixed element to a set element in a downlink channel matrix of a transmission point that does not directly or indirectly determine a ratio relationship with the transmission point; or

Corresponding to at least one channel ratio determined by each transmission point except the set transmission point, the channel ratio determined by the corresponding one transmission point is: the setting element in the downlink channel matrix of the transmission point is not directly connected to the transmission point Or indirectly determining the ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship.

The method according to claim 3, wherein the channel ratio is specifically: a ratio of a set element in a downlink channel matrix of the transmission point to a set element in a downlink channel matrix of the set transmission point. .

5. The method according to claim 4, wherein when the channel ratio determined by the corresponding one transmission point is a set element in a downlink channel matrix of the transmission point and a downlink channel matrix of a preset transmission point, When the ratio of the elements is set, the at least one channel ratio for each transmission point except the preset transmission point is specifically:

r DL,n

n _kl

δ _η = , η=1 , ... , NW≠W ;

Wherein, N is a number of transmission points, ¾J "represents k _n row downlink channel matrix ^H 1 of" column element, k _n, and l _n is a predetermined value, and _{k n {1, -, N} B _{}, l n 6 {1,} · · ·, ^}, η _η for the first transmission to a receiving point End N _R xN ^ dimensional downlink channel matrix, N _{R & lt} is the number of antennas of the receiving end, Λ ^ is the number of antennas of _η transmission points N transmission points, m is the set number of transmission points, and m {1 , ..., N}o

The method according to claim 5, wherein determining the joint downlink channel matrix of each transmission point comprises:

The joint downlink channel matrix H ^{DL of} each transmission point is determined according to the following formula:

7 UL,m

H ^DL = H

Where , is the N _R X Ν _τ dimension upstream channel matrix from the receiving end to the nth transmission point, ^ is the number of antennas at the receiving end, ^ is the number of antennas of the nth transmission point among the N transmission points, m is the Set the number of the transmission point, and m6 {1, ..., N}, 3⁄4„ is a constant, indicating the difference between the uplink and downlink channels of the mth transmission point.

The method according to claim 3, wherein the downlink channel information fed back by the receiving end comprises at least one element in a downlink channel matrix of the corresponding transmission point and/or a downlink channel including a corresponding transmission point. When the ratio of the set element in the matrix to the set element in the downlink channel matrix of the non-set transmission point, the joint downlink channel matrix of each transmission point is determined, which specifically includes:

Determining each according to at least one element in the downlink channel matrix of the corresponding transmission point and/or according to a ratio of a setting element in a downlink channel matrix of each corresponding transmission point to a setting element in a downlink channel matrix of the non-set transmission point The channel ratio between the transmission point and the set transmission point:

r DL,n

S _n = , n=l, NM≠W;

Where N is the number of transmission points, Η is the N _R XN _T -dimensional uplink channel matrix from the receiving end to the nth transmission point, N _R is the number of antennas at the receiving end, and Λ^ is the nth transmission point among the N transmission points the number of antennas by the value "k _n of the first row in the" downlink channel matrix ^H column element, and 1¾ _ι η is set in advance, and _{k n e {ΐ, ···,} ^}, ι η { 1,···,Λ^} , _m is the number of the set transmission point, and _m {l, ..., N}, (3⁄4 is a constant, indicating the difference between the uplink and downlink channels of the mth transmission point.

The method according to claim 3, wherein: the downlink channel information fed back by the receiving end is specific And: determining, by the receiving end, at least one element in the downlink channel matrix corresponding to the transmission point, determining each transmission, the joint downlink channel matrix, specifically:

Where N is the number of transmission points, Η is the N _R XN^ upstream channel matrix from the receiving end to the nth transmission point, N _R is the number of antennas at the receiving end, and Λ^ is the nth transmission point among the N transmission points the number of antennas by the value "k _n of the first row in the" downlink channel matrix ^H column element, and 1¾ _ι η is set in advance, and _{k n e {ΐ, ···,} ^}, ι η { 1,···,Λ^} , _m is the number of the set transmission point, and _m {l, ..., N}, (3⁄4 is a constant, indicating the difference between the uplink and downlink channels of the mth transmission point.

9. A channel information feedback method, comprising:

And downlink channel information is fed back according to the downlink channel matrix or the joint downlink channel matrix of each transmission point.

The method according to claim 9, wherein the feeding back downlink channel information comprises: feeding back at least one channel ratio determined according to each transmission point and/or at least one of a downlink channel matrix corresponding to the transmission point An element, the channel ratio determined by the corresponding one transmission point is: a setting in a downlink channel matrix of a transmission element of a downlink channel matrix of the transmission point and a transmission point that does not directly or indirectly determine a ratio relationship with the transmission point. The ratio of the elements; or

The feedback corresponds to at least one channel ratio determined by each transmission point except the set transmission point, and the channel ratio determined by the corresponding one transmission point is: a setting element in the downlink channel matrix of the transmission point and the transmission point The ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship is directly or indirectly determined.

The method according to claim 10, wherein the channel ratio is specifically: and "≠ W ;

Wherein, v is a number of transmission points "represents k _n row downlink channel matrix ^Η 1 of" column element, k _n, and l _n is a predetermined value, and _{k n {1, -, N} B} _{, l n 6 {1, ···} , ^}, η for the first _η th transmission point to the reception side N _R XN ^ dimensional downlink channel matrix, N _R is the number of antennas of the receiving end, Λ ^ is Ν transmission point of _The number of antennas of _n transmission points, m is a preset value, and m {l, ..., Ν}.

The method according to any one of claims 9-11, wherein the feedback downlink channel information is specifically: feeding back the downlink channel information to a preset central transmission point; or

Feeding back downlink channel information corresponding to the transmission point to each transmission point; or

13. A channel information acquisition system, comprising:

a receiving end, configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point; and feed back downlink channel information according to the downlink channel matrix or the joint downlink channel matrix of each transmission point;

a central node, configured to determine an uplink channel matrix from the receiving end to each transmission point according to the obtained channel parameter of the uplink channel of the receiving end to each transmission point; according to the uplink channel matrix of each transmission point and the determined downlink channel of each transmission point Determining a reciprocal relationship between the uplink channel and the joint downlink channel matrix of each transmission point, where the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is based on the uplink channel parameters of each transmission point and the feedback of the receiving end The downlink channel information is determined.

14. A channel information acquiring apparatus, comprising:

And an obtaining unit, configured to determine, according to the obtained channel parameter of the uplink channel of the receiving end to each transmission point, an uplink channel matrix of the receiving end to each transmission point;

a channel information acquiring unit, configured to determine, according to an uplink channel matrix of each transmission point and a determined reciprocal relationship between a downlink channel and an uplink channel of each transmission point, a joint downlink channel matrix of each transmission point, where each of the transmission points The reciprocal relationship between the downlink channel and the uplink channel is determined according to the uplink channel parameter of each transmission point and the downlink channel information fed back by the receiving end.

The device according to claim 14, wherein the obtaining unit is further configured to:

A channel information feedback device, comprising:

a determining unit, configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point; and a feedback unit, configured to feed back downlink channel information according to the downlink channel matrix or the joint downlink channel matrix of each transmission point.