CN103812545B - The feedback method and device of channel state information - Google Patents
The feedback method and device of channel state information Download PDFInfo
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- CN103812545B CN103812545B CN201210439610.2A CN201210439610A CN103812545B CN 103812545 B CN103812545 B CN 103812545B CN 201210439610 A CN201210439610 A CN 201210439610A CN 103812545 B CN103812545 B CN 103812545B
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Abstract
The present invention relates to the feedback method of channel state information and devices.An embodiment according to the present invention, the feedback method of a channel state information include：Several cross polarised antennas in one transfer point are divided into mutiple antennas group, each antenna sets include the antenna that four pairs of cross polarised antennas or at least one have identical polarization direction；Each antenna sets is defined as a channel state information-reference resources CSI-RS resource；And the information of CSI-RS resource defined in sending.This method can further include selectivity and configure specific phase feedback between the two in defined CSI--RS resource, and sends the phase feedback using radio resource control signaling and configure.The diversity gain of cluster shape linear array can be improved in the present invention, supports the precoding of multi-user's multiple data stream and scheduling of network side.
Description
Technical field
The present invention relates to the channel state information (CSI, channel state information) in wireless communication is anti-
Feedback, especially with regard to the feedback method and device of channel state information.
Background technique
Long term evolution (LTE, Long Term Evolution) project be in recent years third generation partner program (3GPP,
3rd Generation Partnership Project) starting maximum new technology development project, it is this with orthogonal frequency
Multiplexing/frequency division multiple access technology (OFDM/FDMA) is that the technology of core is counted as " quasi- 4G " technology.LTE will be that the whole world will be most main from now on
The wide area broadband mobile communication system wanted, following all 2G/3G/3.5G technologies will all reach the same goal by different routes, and uniformly evolve to LTE/
LTE-A (LTE-Advanced) stage.The Standard Edition for having multiple LTE/LTE-A in the industry at present is proposed such as R10, R11
Many rich promising technical solutions, the multipoint cooperative being such as concerned (CoMP, Coordinated Multi-Point).
Meanwhile as one in continuous development and perfect technology, LTE/LTE-A also certainly exists several urgently to be resolved
The problem of.For example according to newest multipoint cooperative technology, the cluster shape linear array of the intensive cross polarised antenna of spacing (CLA,
Clustered linear array) compared to the uniform linear array of vertical polarized antenna have higher priority.And show
Some code books, the antenna that the code book as provided by R10 is arranged primarily directed to uniform linear array.If to cluster shape linear array
The antenna of arrangement uses the code book for being suitable for the antenna of uniform linear array arrangement, then quantifies mistake as caused by code book discomfort
It will lead to the seriousness energy loss that the precoding (non-codebook-based precoding) of code book is not based in multipoint cooperative
It loses.
Therefore it provides a kind of code book of the cluster shape linear array suitable for cross polarised antenna, preferably solves channel shape
The feedback problem of state information becomes the another important topic in LTE/LTE-A.
Summary of the invention
One of the objects of the present invention is to provide a kind of code books of cluster shape linear array suitable for cross polarised antenna.
One embodiment of the invention provides the method for a feeding back channel state information, it includes：It will be in a transfer point
Several cross polarised antennas are divided into mutiple antennas group, and each antenna sets include that four pairs of cross polarised antennas or at least one have
The antenna of identical polarization direction；Each antenna sets is defined as a channel state information-reference resources CSI-RS resource；And
The information of CSI-RS resource defined in sending.
In one embodiment, when antenna is 3D cross polarised antenna in transfer point, the antenna of each antenna sets comes
From same a line or same row in the 3D cross polarised antenna.This method can further include defined in selectivity configuration
Specific phase feedback between the two in CSI-RS resource, and send the phase feedback using radio resource control signaling and configure.It can
By the measurement collection of multipoint cooperative of one or more configurations to a user equipment in defined CSI-RS resource.Implement one
In example, defined CSI-RS resource transmits different data to same user equipment, in another embodiment defined in
Only portion transfers data gives same user equipment in CSI-RS resource.
One embodiment of the invention provides the method for another feeding back channel state information, and this method includes：It is transmitted from one
An antenna is chosen in a pair of cross poliarizing antenna on point, this defines the first channel state information-ginseng to cross polarised antenna
Examine resource CSI-RS resource；Selected antenna is defined as the second CSI-RS resource；And use second CSI-RS resource
Channel state information corrects the channel state information of first CSI-RS resource.
In one embodiment, the order designator of first CSI-RS resource is 1.Second CSI-RS resource does not transmit data
To user equipment, but but second CSI-RS resource configure to the measurement collection of the multipoint cooperative of a user equipment.
One embodiment of the invention provides the method for the feeding back channel state information of terminal side, and this method includes：It receives more
The information of a CSI-RS resource, each of plurality of CSI-RS resource are defined by an antenna sets, which is by one
Several cross polarised antennas in a transfer point divide to obtain, and each antenna sets include four pairs of cross polarised antennas or at least one
The antenna of root polarization direction having the same；Receive specific phase feedback configuration between the two in multiple CSI-RS resource；And base
It is configured in the phase feedback and feeds back a phase relative to another in this specific the two.
In one embodiment, phase feedback configuration is received by radio resource control signaling.
In addition, one embodiment of the invention provides a base station, include：Antenna sets dividing device, will be in a transfer point
Several cross polarised antennas are divided into mutiple antennas group, and each antenna sets include that four pairs of cross polarised antennas or at least one have
The antenna of identical polarization direction；Each antenna sets is defined as a channel state information-ginseng by CSI-RS resource definition device
Examine resource CSI-RS resource；And sending device, send the information of defined CSI-RS resource.
The base station may include phase feedback configuration device, selectivity configure defined in CSI-RS resource it is specific between the two
Phase feedback, and using radio resource control signaling send the phase feedback configure.It also may include measurement collection configuration device, it will
The measurement collection of multipoint cooperative of one or more configurations to a user equipment in defined CSI-RS resource.
Base station according to another embodiment of the present invention includes Antenna selection device, a pair of cross pole from a transfer point
Change and choose an antenna in antenna, this defines the first channel state information-reference resources CSI-RS resource to cross polarised antenna；
Selected antenna is defined as the second CSI-RS resource by CSI-RS resource definition device；And means for correcting, using this second
The channel state information of CSI-RS resource corrects the channel state information of first CSI-RS resource.
The present invention also provides user equipment, an embodiment according to the present invention, which includes：Asset information receipt
Device receives the information of multiple CSI-RS resource, and each of plurality of CSI-RS resource is defined by an antenna sets, antenna
Group is to divide to obtain by several cross polarised antennas in a transfer point, and each antenna sets include four pairs of cross polarised antennas
Or at least one has the antenna of identical polarization direction；Phase feedback configures reception device, receives special in the CSI-RS resource
Fixed phase feedback configuration between the two；And phase feedback device, it is opposite based on one in the specific the two of phase feedback configuration feedback
In another phase.
The present invention solves the problems, such as the information feedback in LTE/LTE-A about cluster shape linear array, improves
The diversity gain (diversity gain) of cluster shape linear array, can support the precoding of multi-user's multiple data stream and the tune of network side
Degree, and can realize the backward compatible and upward development of standard.
Detailed description of the invention
Fig. 1 is the flow chart of channel state information feedback method according to an embodiment of the invention；
Fig. 2 is the cross polarization day that channel state information feedback method according to an embodiment of the invention is applied to two antennas
Schematic diagram when line cluster shape linear array；
Fig. 3 illustrates the flow chart of channel state information feedback method according to an embodiment of the invention；
When Fig. 4 is that channel state information feedback method according to an embodiment of the invention is applied to cross-polarized 3D antenna
Schematic diagram；
Fig. 5 is the feedback of the channel state information of the cross polarised antenna according to an embodiment of the invention for two antennas
The flow chart of method；
Fig. 6 is a specific application example schematic diagram of method shown in fig. 5；
Fig. 7 is the structural schematic block diagram of base station according to an embodiment of the invention；
Fig. 8 is the structural schematic block diagram of base station according to another embodiment of the present invention；
Fig. 9 is the structural schematic block diagram of user equipment according to an embodiment of the invention.
Specific embodiment
Spirit for a better understanding of the present invention makees furtherly it below in conjunction with part preferred embodiment of the invention
It is bright.
In LTE/LTE-A R11, user equipment be can be configured to for each component carrier (CC：Component
Carrier one or more channel state informations) are reported.And in the case where multipoint cooperative, each channel state information is by believing
The combinations of road part and interference sections configures, wherein channel strip be multipoint cooperative measurement concentrate a non-zero power (NZP,
Non-zero power) channel state information-reference signal (CSI-RS, Channel State Information-
Reference Signal) resource.For different channel state informations, the non-zero power CSI-RS resource configured be can be
Different.
With the development of LTE/LTE-A technology, cluster shape linear array (CLA, the clustered of cross polarised antenna
Linear array) it will be by more and more extensive use.And existing code book, the code book as provided by R10 are mainly used for 2 antennas
And 4 antenna uniform linear array.If to the code book that the poliarizing antenna of cluster shape arranged in linear arrays directly uses R10 to provide,
Quantization mistake caused by code book is uncomfortable will the serious performance loss of bring, such as reduction diversity gain.
Information feedback according to an embodiment of the invention (feedback configuration and terminal side including network side it is anti-
Feedback) method and apparatus can solve the above problems.
It is the flow chart of channel state information feedback method according to an embodiment of the invention shown in Fig. 1, this method includes：
In step 10, several cross polarised antennas in one transfer point are divided into mutiple antennas group, each antenna sets in network side
There is the antenna of identical polarization direction comprising four pairs of cross polarised antennas or at least one.It in one embodiment can be by 2 or 4
Cross polarised antenna is divided into two groups, the antenna polarization direction having the same in every group, such as is all vertical polarization.It is real one
8 pairs of 16 cross polarised antennas can be divided into 2 groups by applying in example, every group is all 4 pairs of cross polarised antennas.In step 12, will draw
Each antenna sets got are defined as a CSI-RS resource.Then in step 14, determined by network side, such as base station transmission
The information of the CSI-RS resource of justice is to terminal side, such as user equipment.
It is the intersection that channel state information feedback method according to an embodiment of the invention is applied to two antennas shown in Fig. 2
Schematic diagram when poliarizing antenna cluster shape linear array.X identifies a pair of cross poliarizing antenna in Fig. 2, "/" or " " identify respectively not
A piece antenna (subsequent same) in same polarization direction.Transfer point 20, i.e. CSI-RS resource #1 include two poliarizing antennas.By two
Antenna is divided into two group 22,24, and each group 22,24 is defined as a new CSI-RS resource, and first group 22 is CSI-RS resource #1-
1, second group 24 is CSI-RS resource #1-2；Then CSI-RS resource #1-1 and the information of CSI-RS resource #1-2 are sent to phase
The terminal answered, to complete the feedback configuration of channel state information.The terminal can be provided from CSI-RS resource #1-1 and CSI-RS
Source #1-2 receives data respectively, and feeds back CSI-RS resource #1-1 and CSI- respectively about the feedback configuration of the two based on the received
The channel state information of RS resource #1-2.
The channel state information feedback method of an embodiment according to the present invention is further comprised in network side selectivity
Specific phase feedback between the two in CSI-RS resource defined in configuring, and use radio resource (RRC, Radio
Resource Control) signaling send the phase feedback configuration.For example, user can be configured for embodiment shown in Fig. 2
Equipment feeds back phase of the CSI-RS resource #1-2 relative to CSI-RS resource #1-1, and concrete configuration is as shown in table 1.
The selective phase feedback configuration of table 1
| CSI-RS resource | Phase feedback configuration |
| CSI-RS resource #1-1 | Without phase feedback |
| CSI-RS resource #1-2 | Report the phase relative to CSI-RS resource #1-1 |
Correspondingly, Fig. 3 illustrates the stream of channel state information feedback method according to an embodiment of the invention in terminal side
Cheng Tu.As shown in figure 3, the channel state information feedback method includes：It is received in step 30 multiple as previously described according to antenna sets
The information of the CSI-RS resource of definition, such as above-mentioned CSI-RS resource #1-1 and CSI-RS resource #1-2.It is received in step 32 multiple
Specific phase feedback configuration between the two in CSI-RS resource, such as receive it is as described in Table 1 about CSI-RS resource #1-1 with
The phase feedback of CSI-RS resource #1-2 configures.Then one is based in received phase feedback configuration feedback the two in step 34
Relative to another phase, such as report the phase relative to CSI-RS resource #1-1.
It in another embodiment of the invention, can be by one or more configurations in defined CSI-RS resource to one
The measurement collection of the multipoint cooperative of user equipment, the configuration are transparent to the user equipment.
These are not limited to data identical to same user device transmissions, Ke Yichuan according to the CSI-RS resource that antenna sets define
Defeated different data can not pass data or only part CSI-RS resource transmission data.With regard to embodiment shown in Fig. 2
Speech, CSI-RS resource #1-1 and CSI-RS resource #1-2 can send data to user equipment, can also not send out, or only its
One of as CSI-RS resource #1-1 send.
When Fig. 4 is that channel state information feedback method according to an embodiment of the invention is applied to cross-polarized 3D antenna
Schematic diagram.It is that need to be grouped in the way of row or column being grouped to 3D poliarizing antenna, does not go together and the pole of different lines
Same antenna group will not be assigned to by changing antenna；And it does not need all to be grouped all row or column.In the present embodiment, first
The 3D antenna that CSI-RS resource 40 (CSI-RS resource #4) includes is the combination that two rows 4 arrange totally 16 antennas.By second after grouping
Four pairs of capable crossed antennas are defined as the second CSI-RS resource 42 (CSI-RS resource #4-1), 4 crossed antennas by first row
It is divided into two groups again by polarization direction and is respectively defined as third CSI-RS resource 44 (CSI-RS resource #4-2) and the 3rd CSI-RS money
Source 46 (CSI-RS resource #4-3)；The first row is not used for defining new CSI-RS resource.It in other embodiments, can also be by first
Capable crossed antenna is divided into one group, the crossed antenna of the first row or the second row can also be made further grouping by polarization direction；Together
Sample, it is also such to each column.
For embodiment shown in Fig. 4, configuration user equipment feedback CSI-RS resource #4-3 can choose relative to CSI-
The phase of RS resource #4-2, concrete configuration are as shown in table 2.
The selective phase feedback configuration of table 1
Another embodiment according to the present invention, for the cross polarised antenna of two antennas, to avoid received channel status
Information feedback, as pre-coding matrix index (PMI, Precoding Matrix Indicator)/channel quality instruction (CQI,
Channel Quality Indicator) it is inaccurate, the channel state information that can choose a wherein antenna carries out school to it
Just.Fig. 5 is the feedback method of the channel state information of the cross polarised antenna according to an embodiment of the invention for two antennas
Flow chart, Fig. 6 is a specific application example schematic diagram of method shown in fig. 5.In conjunction with Fig. 5,6, this method includes, in step
One is chosen in 50 a pair of cross poliarizing antenna from a transfer point 60, i.e. the first CSI-RS resource 60 (CSI-RS resource #1)
Root antenna, the order designator (RI, Rank Indicator) of preferable first CSI-RS resource are 1；Step 52 will be selected
The antenna taken is defined as the second CSI-RS resource 62 (CSI-RS resource #1-1)；Second CSI-RS resource 62 is used in step 54
Channel state information correct the channel state information of first CSI-RS resource 60.Since the second CSI-RS resource 62 only has one
A antenna port, user equipment can only feed back a channel quality instruction, thus the channel of the second CSI-RS resource 62 can be used
Quality instruction corrects the CQI/PMI feedback of former i.e. the first CSI-RS resource of CSI-RS resource.
Second CSI-RS resource 62 is used only as assisting correction information feedback, sets without transmitting data to user
It is standby, but can configure to the measurement collection of the multipoint cooperative of user equipment, which is equally transparent to user equipment.
In addition, the present invention also provides the information feedback dresses for implementing above-mentioned channel state information feedback method
It sets, such as base station or user equipment.Fig. 7 is the structural schematic block diagram of base station 70 according to an embodiment of the invention.The base station 70 packet
Several cross polarised antennas in one transfer point are divided into mutiple antennas group, each antenna by dividing device containing antenna sets 700
Group has the antenna of identical polarization direction comprising four pairs of cross polarised antennas or at least one.Antenna is that 3D is handed in certain transfer point
When pitching poliarizing antenna, the same a line or same row of the antenna of each antenna sets in 3D cross polarised antenna；CSI-RS resource
Each antenna sets is defined as a channel state information-reference resources CSI-RS resource by definition device 702；And send dress
704 are set, sends the information of defined CSI-RS resource to user equipment.
In other embodiments, which further includes phase feedback configuration device, selectively defined in configuration
Specific phase feedback between the two in CSI-RS resource, and send the phase feedback using radio resource control signaling and configure.Base
Standing 70 also may include measurement collection configuration device, by one or more configurations in defined CSI-RS resource a to user equipment
Multipoint cooperative measurement collection.
Fig. 8 is the structural schematic block diagram of base station 80 according to another embodiment of the present invention.The base station 80 includes Antenna selection
Device 800 chooses an antenna from a pair of cross poliarizing antenna in a transfer point, this is to cross polarised antenna definition the
One channel state information-reference resources CSI-RS resource；Selected antenna is defined as by CSI-RS resource definition device 802
Second CSI-RS resource；And means for correcting 804, the first CSI- is corrected using the channel state information of second CSI-RS resource
The channel state information of RS resource.
The base station 80 equally may include measurement collection configuration device, which is configured to a user equipment
The measurement collection of multipoint cooperative.
Fig. 9 is the structural schematic block diagram of user equipment 90 according to an embodiment of the invention.The user equipment 90 includes money
Source information reception device 900 receives the information of multiple CSI-RS resource, and each of plurality of CSI-RS resource was by one day
The definition of line group, antenna sets are to divide to obtain by several cross polarised antennas in a transfer point, and each antenna sets include four
There is the antenna of identical polarization direction to cross polarised antenna or at least one；Phase feedback configures reception device 902, receives more
Specific phase feedback configuration between the two in a CSI-RS resource；And phase feedback device 904, based on phase feedback configuration feedback
A phase relative to another in specific the two.
The present invention reduces the amount of information feedback by being grouped to cross polarised antenna according to polarization direction
Change error, improve the diversity gain of cluster shape linear array, and can support network side the precoding of multi-user's multiple data stream and
Scheduling.It is applicable not only to multipoint cooperative and is also applied for multi-user-mostly into having more (MU-MIMO, Multiple User-Multiple
Input Multiple Output) system.
It should be pointed out that component with the same function often has more due to the development of technology and the update of standard
A different address.Technical term used in present patent application book is to explain and demonstrating technical side of the invention
Case subject to the function that Ying Yiqi is known together in the art, and only cannot be interpreted arbitrarily with the similarities and differences of title.
Technology contents and technical characterstic of the invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention in teachings of the present invention and announcement.Therefore, protection model of the invention
The revealed content of embodiment should be not limited to by enclosing, and should include various without departing substantially from replacement and modification of the invention, and be this patent
Application claims are covered.
Claims (8)
1. a kind of method for feeding back channel state information, includes：
An antenna is chosen from a pair of cross poliarizing antenna in a transfer point, this defines the first letter to cross polarised antenna
Channel state information-reference resources CSI-RS resource；
Selected antenna is defined as the second CSI-RS resource；
The channel state information of first CSI-RS resource is corrected using the channel state information of second CSI-RS resource.
2. the method as described in claim 1 further includes and configures second CSI-RS resource to a user equipment
The measurement collection of multipoint cooperative.
3. the method as described in claim 1, wherein second CSI-RS resource does not transmit data to user equipment.
4. the method as described in claim 1, wherein the order designator of first CSI-RS resource is 1.
5. a kind of base station, includes：
Antenna selection device chooses an antenna from a pair of cross poliarizing antenna in a transfer point, this is to cross polarization
Antenna defines the first channel state information-reference resources CSI-RS resource；
Selected antenna is defined as the second CSI-RS resource by CSI-RS resource definition device；
Means for correcting corrects the channel status of first CSI-RS resource using the channel state information of second CSI-RS resource
Information.
6. base station as claimed in claim 5 further includes measurement collection configuration device, which is configured
To the measurement collection of the multipoint cooperative of a user equipment.
7. base station as claimed in claim 5, wherein second CSI-RS resource does not transmit data to user equipment.
8. base station as claimed in claim 5, wherein the order designator of first CSI-RS resource is 1.
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| CN113708805A (en) * | 2015-03-31 | 2021-11-26 | 索尼公司 | Electronic device and wireless communication method in wireless communication system |
| CN106656292B (en) * | 2015-10-29 | 2020-03-31 | 电信科学技术研究院 | Feedback method of channel state information, base station and terminal |
| WO2017078588A1 (en) * | 2015-11-05 | 2017-05-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and systems for csi-rs port selection for csi-reporting |
| CN106899522B (en) * | 2015-12-17 | 2019-11-19 | 中国移动通信集团公司 | A kind of sending method, device and the base station of channel state information reference signals CSI-RS |
| CN107294643B (en) | 2016-03-31 | 2021-07-02 | 中兴通讯股份有限公司 | Method and device for feeding back and configuring channel state information |
| WO2017166288A1 (en) * | 2016-04-01 | 2017-10-05 | Qualcomm Incorporated | Csi-rs design for larger number of antenna ports for efd-mimo |
| CN106253957A (en) * | 2016-09-06 | 2016-12-21 | 北京北方烽火科技有限公司 | Beam form-endowing method, device and base station |
| WO2018161243A1 (en) * | 2017-03-07 | 2018-09-13 | Aruba Networks, Inc. | Antenna polarization patterns |
| CN112242862A (en) * | 2019-07-18 | 2021-01-19 | 中国移动通信有限公司研究院 | Information reporting method, terminal and network side equipment |
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