CN105577328B - A kind of channel state information feedback method and terminal - Google Patents
A kind of channel state information feedback method and terminal Download PDFInfo
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- CN105577328B CN105577328B CN201410528578.4A CN201410528578A CN105577328B CN 105577328 B CN105577328 B CN 105577328B CN 201410528578 A CN201410528578 A CN 201410528578A CN 105577328 B CN105577328 B CN 105577328B
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Abstract
The invention discloses a kind of channel state information feedback method and terminals to reduce feedback overhead and computation complexity with problem that is big to avoid feedback overhead caused by the channel state information for feeding back each CSI process in existing scheme respectively, calculating complexity.This method are as follows: terminal obtains more than two corresponding channel matrixes of channel state information reference signals CSI-RS resource；The terminal determines intermediate parameters according to each channel matrix, determines that one group or two groups of channel state informations, channel state information described in every group include order, pre-coding matrix instruction and channel quality information according to the intermediate parameters；Described one group or two groups of channel state informations are sent to base station by the terminal.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of channel state information feedback method and terminals.
Background technique
Closed loop precoding technology is introduced in long term evolution (LTE) Rel-8 system to improve frequency efficiency.Closed loop precoding
It is required that saving the set of the same pre-coding matrix, referred to as code book respectively in base station and terminal.Terminal is according to cell common pilots
After estimating channel information, a pre-coding matrix is selected from code book by certain criterion.It is mutual that Criterion of Selecting can be maximization
Information content, maximization output Signal to Interference plus Noise Ratio etc..The index of the pre-coding matrix selected in the codebook is passed through up channel by terminal
It feeds back to base station, which is denoted as pre-coding matrix instruction (Precoding Matrix Indicator, PMI).Base station according to
The search index code book received determines the pre-coding matrix that terminal uses.The index for the pre-coding matrix that terminal reports can be seen
Work is the quantized value of channel state information.
Other than PMI, terminal can also report rank indication information (Rank Indicator, RI) and channel quality information
(Channel Quality Indicator, CQI).Wherein, RI corresponds to the independent data flow amount of spatial multiplexing transmission, i.e.,
The spatial data flow amount that space channel from base station to terminal can at most be supported is indicated by RI.CQI is for balancing from base station
To the channel quality of terminal, the foundation selected as modulation system and code rate.Base station is to end in LTE and LTE-A standard
End one data block of transmission is known as a code word, and in case of spatial multiplexing, base station at most can be simultaneously to terminal transmission two
A code word can also only transmit a code word.The data of one code word are mapped to one or more spaces according to certain rules
In data flow.If it is the transmission of two code words, then the number of total data flow of two code words mapping is not to be exceeded base station and arrives
The space channel of terminal is at best able to the number for the data flow supported, which passes through terminal
The RI reported is obtained.If space channel can support the transmission of multiple data flows, i.e. RI > 1, then it represents that the biography of base station to terminal
Defeated is the transmission of two code words, and terminal calculates separately the CQI of two code words and feeds back to base station.
Most 3 channel state information reference signals (CSI- can be configured for a terminal in LTE Rel-10 system
RS the port number of) resource, each CSI-RS resource can be 1,2,4,8；Terminal can have up to 3 CSI processes and feed back respectively
Corresponding channel state information.For example, it is assumed that a CSI-RS resource is 8 ports, 3 CSI-RS resource one share 24 CSI-
The port RS, terminal measures in each CSI-RS resource respectively and generates 3 sets of channel state informations feeds back to base station respectively.
Base Transmitter antenna data may be very more in three-dimensional multiple-input and multiple-output (3D MIMO) system, and CSI-RS
Port number may also can be very much, one of configuration method is the multiple CSI-RS resource of configuration.For example, such as Fig. 1 a and Fig. 1 b institute
The antenna for base station number shown be 64 (vertically be 8, level is 8), base station 8 CSI-RS resource of configuration are 8 ports, one
8 port CSI-RS resource correspond to 8 antennas of 8 antennas of vertical dimension or horizontal dimension, and terminal can detect 88 port CSI-RS moneys
Source.If being that terminal configures 8 CSI processes according to the method for Rel-10, terminal is respectively to the corresponding channel of each CSI progress feedback
Status information, terminal need to feed back altogether 8 sets of CSI information, and every set CSI information includes RI, PMI and CQI.
In prior art, terminal feeds back the channel state information of each CSI process respectively, antenna data it is big be
The feedback overhead occupied in system is very big, and base station implementation complexity is high.Example is connected, 8 sets of CSI information are fed back, compared to feedback
A set of CSI information increases 7 times of feedback overhead, also, base station needs to calculate transmission letter after 8 sets of CSI information of reception
Number corresponding RI, PMI and CQI, obtain accurately send RI, PMI and CQI of signal process it is complicated.
Summary of the invention
The embodiment of the present invention provides a kind of channel state information feedback method and terminal, with to avoid in existing scheme respectively
Feed back that feedback overhead caused by the channel state information of each CSI process is big, calculates complicated problem, reduce feedback overhead and
Computation complexity.
Specific technical solution provided in an embodiment of the present invention is as follows:
In a first aspect, providing a kind of channel state information feedback method, comprising:
Terminal obtains more than two corresponding channel matrixes of channel state information reference signals CSI-RS resource；
The terminal determines intermediate parameters according to each channel matrix, determines one group or two according to the intermediate parameters
Group channel state information, channel state information described in every group includes order, pre-coding matrix instruction and channel quality information；
Described one group or two groups of channel state informations are sent to base station by the terminal.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
One group of channel state information, comprising:
The average value that the terminal calculates all channel matrixes obtains equivalent channel matrix, according to the equivalent channel
Matrix determine one group described in channel state information.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
Two groups of channel state informations, comprising:
Described two above CSI-RS resource are divided into two groups by the terminal, are calculated every group of CSI-RS resource and are respectively contained
The corresponding channel matrix of all CSI-RS resource average value, obtain the corresponding equivalent letter of every group of CSI-RS resource
Road matrix, according to the corresponding equivalent channel matrix of every group of CSI-RS resource determine two groups described in channel state information.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
One group of channel state information, comprising:
The average value that the terminal calculates all channel matrixes obtains equivalent channel matrix, according to each channel
Matrix, which calculates, obtains the corresponding order of each CSI-RS resource, and the average value for calculating each order obtains average rank value, according to described
Equivalent channel matrix and the average rank value calculate and obtain pre-coding matrix instruction and channel quality information, will be described average
Rank value, the pre-coding matrix instruction for calculating acquisition and the channel quality information are determined as one group of channel status letter
Breath.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
Two groups of channel state informations, comprising:
Described two above CSI-RS resource are divided into two groups by the terminal, are calculated every group of CSI-RS resource and are respectively contained
The corresponding channel matrix of all CSI-RS resource average value, obtain the corresponding equivalent letter of every group of CSI-RS resource
Road matrix；
It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS
The average value for all orders that resource respectively contains obtains the corresponding average rank value of every group of CSI-RS resource；
It is obtained according to the respective equivalent channel matrix of every group of CSI-RS resource and the respective average rank value, calculating
Obtain the corresponding pre-coding matrix instruction of every group of CSI-RS resource and the channel quality information；
According to the corresponding average rank value of every group of CSI-RS resource, pre-coding matrix instruction and the channel matter
Information is measured, determines two groups of channel state informations.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
One group of channel state information, comprising:
The terminal calculates respectively according to each channel matrix and obtains the corresponding channel status of each CSI-RS resource
Special parameter in information selects a CSI-RS resource according to each special parameter and preset rules, calculates selection
The corresponding one group of channel state information of the CSI-RS resource as the determining channel state information.
Preferably, the terminal determines intermediate parameters according to each channel matrix, is determined according to the intermediate parameters
Two groups of channel state informations, comprising:
The terminal calculates respectively according to each channel matrix and obtains the corresponding channel status of each CSI-RS resource
Special parameter in information；
Described two above CSI-RS resource are divided into two groups by the terminal；
The terminal is directed to every group of CSI-RS resource respectively, according to the corresponding each specific ginseng of this group of CSI-RS resource
Several and preset rules select a CSI-RS resource；
The terminal, which calculates separately, each of selects the corresponding one group of channel state information of the CSI-RS resource as really
Channel state information described in fixed two groups.
It is preferably, described that a CSI-RS resource is selected according to each special parameter and preset rules, comprising:
The terminal determines the minimum value in each special parameter, from the corresponding CSI-RS resource of the minimum value
Select a CSI-RS resource；
Alternatively,
The terminal determines the maximum value in each special parameter, from the corresponding CSI-RS resource of the maximum value
Select a CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, the method also includes:
The mark of the CSI-RS resource of selection is sent to the base station by the terminal.
Second aspect provides a kind of terminal, comprising:
Module is obtained, for obtaining more than two corresponding letters of channel state information reference signals CSI-RS resource
Road matrix；
Determining module, for determining intermediate parameters according to each of the acquisition module acquisition channel matrix, according to
The intermediate parameters determine that one group or two groups of channel state informations, channel state information described in every group include order, pre-coding matrix
Instruction and channel quality information；
Sending module, for described one group of determining module determination or two groups of channel state informations to be sent to base
It stands.
Preferably, the determining module is specifically used for:
The average value for calculating all channel matrixes obtains equivalent channel matrix, is determined according to the equivalent channel matrix
Channel state information described in one group.
Preferably, the determining module is specifically used for:
Described two above CSI-RS resource are divided into two groups, calculate that every group of CSI-RS resource respectively contain is all
The average value of the corresponding channel matrix of CSI-RS resource obtains the corresponding equivalent channel square of every group of CSI-RS resource
Battle array, according to the corresponding equivalent channel matrix of every group of CSI-RS resource determine two groups described in channel state information.
Preferably, the determining module is specifically used for:
The average value for calculating all channel matrixes obtains equivalent channel matrix, is calculated according to each channel matrix
The corresponding order of each CSI-RS resource is obtained, the average value for calculating each order obtains average rank value, according to the equivalent channel
Matrix and the average rank value calculate and obtain pre-coding matrix instruction and channel quality information, by the average rank value, meter
It calculates the pre-coding matrix instruction obtained and the channel quality information is determined as one group of channel state information.
Preferably, the determining module is specifically used for:
Described two above CSI-RS resource are divided into two groups, calculate that every group of CSI-RS resource respectively contain is all
The average value of the corresponding channel matrix of CSI-RS resource obtains the corresponding equivalent channel square of every group of CSI-RS resource
Battle array；
It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS
The average value for all orders that resource respectively contains obtains the corresponding average rank value of every group of CSI-RS resource；
It is obtained according to the respective equivalent channel matrix of every group of CSI-RS resource and the respective average rank value, calculating
Obtain the corresponding pre-coding matrix instruction of every group of CSI-RS resource and the channel quality information；
According to the corresponding average rank value of every group of CSI-RS resource, pre-coding matrix instruction and the channel matter
Information is measured, determines two groups of channel state informations.
Preferably, the determining module is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter selects a CSI-RS resource according to each special parameter and preset rules, calculates the described of selection
The corresponding one group of channel state information of CSI-RS resource is as the determining channel state information.
Preferably, the determining module is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter；
Described two above CSI-RS resource are divided into two groups；
It is directed to every group of CSI-RS resource respectively, according to the corresponding each special parameter of this group of CSI-RS resource and in advance
If rule one CSI-RS resource of selection；
It calculates separately and each of selects the corresponding one group of channel state information of the CSI-RS resource as determining two groups
The channel state information.
Preferably, the determining module is specifically used for:
It determines the minimum value in each special parameter, one is selected from the corresponding CSI-RS resource of the minimum value
CSI-RS resource；
Alternatively,
It determines the maximum value in each special parameter, one is selected from the corresponding CSI-RS resource of the maximum value
CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, the sending module is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
Based on the above-mentioned technical proposal, in the embodiment of the present invention, terminal is obtaining multiple corresponding letters of CSI-RS resource
After road matrix, intermediate parameters are determined according to each channel matrix, determine one group or two groups of channel status letters according to the intermediate parameters
Breath, is sent to base station for determining this group or two groups of channel state informations, thus in the case where there is multiple CSI processes, only
One group or two groups of channel state informations, which need to be fed back, reduces feedback overhead to base station, and reduces the computation complexity of base station.
Detailed description of the invention
Fig. 1 a is the CSI-RS resource configuration schematic diagram that antenna for base station number is 64；
Fig. 1 b is another CSI-RS resource configuration schematic diagram that antenna for base station number is 64；
Fig. 2 is the method flow schematic diagram of terminal feeding back channel state information in the embodiment of the present invention；
Fig. 3 is terminal structure schematic diagram in the embodiment of the present invention；
Fig. 4 is another terminal structure schematic diagram in the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
As shown in Fig. 2, the method detailed process of terminal feeding back channel state information is as follows in the embodiment of the present invention:
Step 201: terminal obtains more than two corresponding channel matrixes of CSI-RS resource.
Specifically, the line number of the antenna of the number and base station side of CSI-RS resource or columns are identical.If base station is from each column day
Line sends measurement pilot tone, then the columns of antenna of number and base station side of CSI-RS resource is identical；If base station is sent out from every row antenna
Measurement pilot tone is sent, then the line number of antenna of number and base station side of CSI-RS resource is identical.
In specific implementation, terminal carries out channel measurement in multiple CSI-RS resource respectively, obtains multiple CSI-RS money
The corresponding channel matrix in source.
For example, base station side, equipped with 2 dimension antennas, which is made of N row and M array antenna, and General N and M are even numbers,
Base station can individually send measurement pilot tone from every row or every array antenna, and the pilot frequency port number on general every row or each column is identical.It is false
If base station sends measurement pilot tone from every array antenna, M set measurement pilot tone is sent altogether, every set pilot tone is one or more ports, phase
Ying Di, terminal measure channel in M CSI-RS resource respectively, obtain the channel status letter of a set of corresponding M CSI-RS resource
It ceases and feeds back to base station.Assuming that base station sends measurement pilot tone from every row antenna, N set measurement pilot tone is sent altogether, and every set pilot tone is
One or more ports, correspondingly, terminal measure channel in N CSI-RS resource respectively, obtain the N number of CSI-RS of a set of correspondence
The channel state information of resource simultaneously feeds back to base station.
Step 202: terminal determines intermediate parameters according to each channel matrix of acquisition, determines one group according to the intermediate parameters
Or two groups of channel state informations.
Wherein, every group of channel state information includes order, pre-coding matrix instruction and channel quality information.
Preferably, terminal determines intermediate parameters, determines one group of channel state information according to the intermediate parameters, including but unlimited
In following several embodiments:
The first, the average value that terminal calculates all channel matrixes obtains equivalent channel matrix, according to the equivalent channel square
Battle array determines one group of channel state information.Specifically, terminal is averaging after all channel matrixes add up, and obtains equivalent channel square
Battle array.
Second, the average value that terminal calculates all channel matrixes obtains equivalent channel matrix, according to each channel matrix
It calculates and obtains the corresponding order of each CSI-RS resource, the average value for calculating each order obtains average rank value, according to the equivalent letter of acquisition
Road matrix and average rank value calculate and obtain pre-coding matrix instruction and channel quality information, by the rank value that is averaged, calculate and obtain
The pre-coding matrix instruction and the channel quality information obtained is determined as one group of channel state information.
Preferably, after the average value for calculating each order, rounding operation, the knot that will be obtained after rounding operation are carried out to the average value
Fruit is as average rank value.Wherein it is possible to be to round up to the average value or be rounded downwards.
The third, terminal calculates respectively according to each channel matrix and obtains the corresponding channel status of each CSI-RS resource
Special parameter in information selects a CSI-RS resource according to each special parameter and preset rules, calculates selection
The corresponding one group of channel state information of CSI-RS resource is as determining channel state information.
In the third specific implementation, selecting the concrete mode of a CSI-RS resource includes but is not limited to following two:
The first, terminal determines the minimum value in each special parameter, selects from the corresponding CSI-RS resource of the minimum value
Select a CSI-RS resource, wherein if the corresponding CSI-RS resource more than one of the minimum value, corresponding from the minimum value
One is randomly choosed in CSI-RS resource.
Second, terminal determines the maximum value in each special parameter, selects from the corresponding CSI-RS resource of the maximum value
Select a CSI-RS resource, wherein if the corresponding CSI-RS resource more than one of the maximum value, corresponding from the maximum value
One is randomly choosed in CSI-RS resource.
Preferably, in the third specific implementation, special parameter can be any one in order or channel quality information.
Preferably, in the third specific implementation, the mark of the CSI-RS resource of selection is sent to base station by terminal.
Preferably, more than two CSI-RS resource are divided into two groups by terminal, corresponding every according to every group of CSI-RS resource
A channel matrix determines every group of respective intermediate parameters of CSI-RS resource, according to every group of CSI-RS resource it is respective it is described in
Between parameter determine the corresponding one group of channel state information of every group of CSI-RS resource, obtain two groups of channel state informations.Specifically
Implementation includes but is not limited to following several:
The first, more than two CSI-RS resource are divided into two groups by terminal, are calculated every group of CSI-RS resource and are respectively contained
The corresponding channel matrix of all CSI-RS resource average value, obtain the corresponding equivalent letter of every group of CSI-RS resource
Road matrix determines two groups of channel state informations according to every group of corresponding equivalent channel matrix of CSI-RS resource.
Second, described two above CSI-RS resource are divided into two groups by terminal, calculate every group of CSI-RS resource respectively
It is corresponding etc. to obtain every group of CSI-RS resource for the average value of the corresponding channel matrix of all CSI-RS resource for including
Imitate channel matrix；
It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS
The average value for all orders that resource respectively contains obtains the corresponding average rank value of every group of CSI-RS resource；
It is obtained according to the respective equivalent channel matrix of every group of CSI-RS resource and the respective average rank value, calculating
Obtain the corresponding pre-coding matrix instruction of every group of CSI-RS resource and the channel quality information；
According to the corresponding average rank value of every group of CSI-RS resource, pre-coding matrix instruction and the channel matter
Information is measured, determines two groups of channel state informations.
The third, terminal calculates respectively according to each channel matrix and obtains the corresponding channel of each CSI-RS resource
Special parameter in status information；
Described two above CSI-RS resource are divided into two groups by terminal；
Terminal is directed to every group of CSI-RS resource respectively, according to the corresponding each special parameter of this group of CSI-RS resource with
And preset rules select a CSI-RS resource；
Terminal, which calculates separately, each of selects the corresponding one group of channel state information of the CSI-RS resource as determining
Channel state information described in two groups.
In the third specific implementation, selecting the mode of a CSI-RS resource includes but is not limited to following two:
The first, terminal determines the minimum value in each special parameter, from the corresponding CSI-RS money of the minimum value
A CSI-RS resource is selected in source；
Second, terminal determines the maximum value in each special parameter, from the corresponding CSI-RS money of the maximum value
A CSI-RS resource is selected in source.
Preferably, in the third specific implementation, special parameter can be any one in order or channel quality information
Kind.
Preferably, in the third specific implementation, the mark of the CSI-RS resource of selection is sent to base station by terminal.
Step 203: determining this group or two groups of channel state informations are sent to base station by terminal.
The third embodiment and two groups of letters determined above in specific implementation, in one group of channel state information determined above
In the third embodiment in channel state information, the mode that the mark of the CSI-RS resource of selection is sent to base station has following two
Kind:
The first, the order in the mark and channel state information of the CSI-RS resource of selection carries out combined coding, with channel
Status information feeds back to base station together.
It is second, by defining the format of uplink control channel (PUCCH), the mark of the CSI-RS resource of selection is independent
Base station is fed back to, feedback cycle is individually designed, can be identical as the feedback cycle of channel state information, it can also be different.
The detailed process of terminal feeding back channel state information is illustrated below by way of two specific embodiments.
Following two specific embodiment, the aerial array schematic diagram of 64 ports in conjunction with shown in Fig. 1 a, if being divided according to column
8 column, 8 ports of each column can be divided into；The aerial array schematic diagram of 64 ports in conjunction with shown in Fig. 1 b, if can be drawn according to row division
It is divided into 8 rows, 8 ports of every row.Base station sends 8 CSI-RS resource according to Fig. 1 a or Fig. 1 b, and each CSI-RS resource has 8 ends
Mouthful.
In first specific embodiment, terminal measures channel in 8 CSI-RS resource respectively, according in mode a- mode f
Any one obtain the channel state information of a set of 8 CSI-RS resource of correspondence and feed back to base station.It is specific as follows:
Mode a, terminal carry out channel measurement in 8 CSI-RS resource respectively, obtain 1~H8 of channel matrix H, to all
Channel matrix, which is averaging, obtains equivalent channel H, then calculates RI, PMI, CQI according to equivalent channel H.
Mode b, terminal carry out channel measurement in 8 CSI-RS resource respectively, obtain 1~H8 of channel matrix H, count respectively
It calculates and obtains each respective channel state information of CSI-RS resource, be expressed as RI_i, PMI_i, CQI_i (i=1~8)；Therefrom select
Take maximum rank value RI_i (i=1~8), if the corresponding CSI-RS resource of maximum rank value have it is multiple, from maximum order
It is worth in corresponding each CSI-RS resource and randomly chooses one.Obtain CSI_RS resource corresponding RI_i, PMI_i and CQI_ of selection
I is simultaneously fed back.RI, PMI and CQI feedback method are identical as existing method.Optionally, selection is fed back according to shown in table 1
The mark i of CSI_RS resource.
Table 1
| CSI-RS identifies i | Feedback bits |
| 1 | 000 |
| 2 | 001 |
| 3 | 010 |
| 4 | 011 |
| 5 | 100 |
| 6 | 101 |
| 7 | 110 |
| 8 | 111 |
Mode c, the process channel measurement in 8 CSI-RS resource, acquisition 1~H8 of channel matrix H are counted terminal respectively respectively
The respective channel state information of each CSI-RS resource is calculated, RI_i, PMI_i, CQI_i (i=1~8) are expressed as；It therefrom chooses most
Small rank value RI_i (i=1~8), if the corresponding CSI-RS resource of the smallest rank value have it is multiple, from the smallest rank value pair
One is randomly choosed in each CSI-RS resource answered.Obtain CSI_RS resource corresponding RI_i, PMI_i and CQI_i of selection simultaneously
It is fed back.RI, PMI and CQI feedback method are identical as existing method.Optionally, according to the CSI_ for feeding back selection shown in table 1
The mark i of RS resource.
Mode d, terminal carry out channel measurement in 8 CSI-RS resource respectively, obtain 1~H8 of channel matrix H, count respectively
It calculates and obtains each respective channel state information of CSI-RS resource, be expressed as RI_i, PMI_i, CQI_i (i=1~8)；Therefrom select
Take maximum CQI value CQI_i (i=1~8), if the corresponding CSI-RS resource of maximum CQI value have it is multiple, most from this
One is randomly choosed in the corresponding each CSI-RS resource of big CQI value.Obtain according to the corresponding RI_i of CSI-RS resource of selection,
PMI_i and CQI_i is simultaneously fed back.RI, PMI and CQI feedback method are identical as existing method.Optionally, according to shown in table 1
Feed back the mark i of the CSI_RS resource of selection.
Mode e, terminal carry out channel measurement in 8 CSI-RS resource respectively, obtain 1~H8 of channel matrix H, count respectively
It calculates and obtains each respective channel state information of CSI-RS resource, be expressed as RI_i, PMI_i, CQI_i (i=1~8)；Therefrom select
Take the smallest CQI value CQI_i (i=1~8), if the corresponding CSI-RS resource of the smallest CQI value have it is multiple, from minimum
The corresponding each CSI-RS resource of CQI value in randomly choose one.Obtain selection CSI_RS resource corresponding RI_i, PMI_i and
CQI_i is simultaneously fed back.RI, PMI and CQI feedback method are identical as existing method.Optionally, it is selected according to feedback shown in table 1
The mark i for the CSI_RS resource selected.
Mode f, terminal carry out channel measurement in 8 CSI-RS resource respectively, obtain 1~H8 of channel matrix H, count respectively
It calculates and obtains each respective channel state information of CSI-RS resource, be expressed as RI_i, PMI_i, CQI_i (i=1~8)；Calculate institute
After having the average value of order RI_i (i=1~8) and rounding (round up or be rounded downwards), average rank value is obtained, and is calculated all
The average value of channel matrix obtains equivalent channel matrix H；According to equivalent channel matrix H and average rank value calculate corresponding PMI and
CQI, using obtained PMI and CQI and average rank value as information feedback to base station.Wherein, RI, PMI and CQI are anti-
Feedback method is identical as existing method.
In second specific embodiment, 8 CSI-RS resource are divided into two groups by terminal, obtain one from every group of CSI-RS resource
Channel state information is covered, two sets of channel state informations are obtained, feed back two groups of channel state informations respectively to base station.
Such as: terminal carries out channel measurement in 8 CSI-RS resource respectively, 1~H8 of channel matrix H is obtained, by 8
CSI-RS resource is divided into two groups, it is assumed that first group include the corresponding CSI-RS resource of 1~H4 of channel matrix H, second group include
The corresponding CSI-RS resource of 5~H8 of channel matrix H.According to any one in the method a-f in the first specific embodiment from
One group of CSI-RS resource obtains a set of channel state information；And according to any in the method a-f in the first specific embodiment
One kind obtaining a set of channel state information from second group of CSI-RS resource.Terminal is respectively two sets of information feedbacks to base
It stands.
Based on the same inventive concept, a kind of terminal is additionally provided in the embodiment of the present invention, the specific implementation of the terminal can be joined
See the description of above method part, overlaps will not be repeated, as shown in figure 3, the terminal specifically includes that
Module 301 is obtained, is respectively corresponded to for obtaining more than two channel state information reference signals CSI-RS resource
Channel matrix；
Determining module 302, for determining intermediate ginseng according to each of the acquisition module 301 acquisition channel matrix
Number determines one group according to the intermediate parameters or two groups of channel state informations, channel state information described in every group includes order, prelists
The instruction of code matrix and channel quality information；
Sending module 303, described one group for determining the determining module 302 or two groups of channel state informations transmissions
To base station.
Specifically, the line number of the antenna of the number and base station side of CSI-RS resource or columns are identical.If base station is from each column day
Line sends measurement pilot tone, then the columns of antenna of number and base station side of CSI-RS resource is identical；If base station is sent out from every row antenna
Measurement pilot tone is sent, then the line number of antenna of number and base station side of CSI-RS resource is identical.
Preferably, it is following several to determine that the mode of one group of channel state information has for determining module 302:
The first, determining module 302 is specifically used for:
The average value for calculating all channel matrixes obtains equivalent channel matrix, is determined according to the equivalent channel matrix
Channel state information described in one group.
Second, determining module 302 is specifically used for:
The average value for calculating all channel matrixes obtains equivalent channel matrix, is calculated according to each channel matrix
The corresponding order of each CSI-RS resource is obtained, the average value for calculating each order obtains average rank value, according to the equivalent channel
Matrix and the average rank value calculate and obtain pre-coding matrix instruction and channel quality information, by the average rank value, meter
It calculates the pre-coding matrix instruction obtained and the channel quality information is determined as one group of channel state information.
The third, determining module 302 is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter selects a CSI-RS resource according to each special parameter and preset rules, calculates the described of selection
The corresponding one group of channel state information of CSI-RS resource is as the determining channel state information.
Preferably, in the third embodiment, the determining module 302 is specifically used for:
It determines the minimum value in each special parameter, one is selected from the corresponding CSI-RS resource of the minimum value
CSI-RS resource；
Alternatively,
It determines the maximum value in each special parameter, one is selected from the corresponding CSI-RS resource of the maximum value
CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, in the third embodiment, the sending module 303 is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
Preferably, more than two CSI-RS resource are divided into two groups by determining module 302, according to every group of CSI-RS resource pair
The channel matrix each of is answered to determine every group of respective intermediate parameters of CSI-RS resource, it is respective according to every group of CSI-RS resource
The intermediate parameters determine the corresponding one group of channel state information of every group of CSI-RS resource, obtain two groups of channel status letters
Breath.Specific implementation includes but is not limited to following several:
The first, determining module 302 is specifically used for:
More than two CSI-RS resource are divided into two groups, calculate all CSI-RS that every group of CSI-RS resource respectively contains
The average value of the corresponding channel matrix of resource obtains every group of corresponding equivalent channel matrix of CSI-RS resource, according to
Every group of corresponding equivalent channel matrix of CSI-RS resource determines two groups of channel state informations.
Second, determining module 302 is specifically used for:
Described two above CSI-RS resource are divided into two groups, calculate that every group of CSI-RS resource respectively contain is all
The average value of the corresponding channel matrix of CSI-RS resource obtains the corresponding equivalent channel square of every group of CSI-RS resource
Battle array；
It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS
The average value for all orders that resource respectively contains obtains the corresponding average rank value of every group of CSI-RS resource；
It is obtained according to the respective equivalent channel matrix of every group of CSI-RS resource and the respective average rank value, calculating
Obtain the corresponding pre-coding matrix instruction of every group of CSI-RS resource and the channel quality information；
According to the corresponding average rank value of every group of CSI-RS resource, pre-coding matrix instruction and the channel matter
Information is measured, determines two groups of channel state informations.
The third, determining module 302 is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter；
Described two above CSI-RS resource are divided into two groups；
It is directed to every group of CSI-RS resource respectively, according to the corresponding each special parameter of this group of CSI-RS resource and in advance
If rule one CSI-RS resource of selection；
It calculates separately and each of selects the corresponding one group of channel state information of the CSI-RS resource as determining two groups
The channel state information.
Preferably, in the third embodiment, the determining module 302 is specifically used for:
It determines the minimum value in each special parameter, one is selected from the corresponding CSI-RS resource of the minimum value
CSI-RS resource；
Alternatively,
It determines the maximum value in each special parameter, one is selected from the corresponding CSI-RS resource of the maximum value
CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, in the third embodiment, sending module 303 is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
Based on the same inventive concept, a kind of terminal is additionally provided in the embodiment of the present invention, the specific implementation of the terminal can be joined
See the description of above method part, overlaps will not be repeated, as shown in figure 4, the terminal mainly includes connecting by bus
Processor 401, memory 402 and transceiver 403, transceiver 403 is for sending and receiving number under the control of processor 401
According to, processor 401 is used to read the program in memory 402, execute following procedure:
Obtain more than two corresponding channel matrixes of channel state information reference signals CSI-RS resource；
Intermediate parameters are determined according to each channel matrix, determine one group or two groups of channel shapes according to the intermediate parameters
State information, channel state information described in every group include order, pre-coding matrix instruction and channel quality information；
Indicate that described one group or two groups of channel state informations are sent to base station by transceiver 403.
Specifically, the line number of the antenna of the number and base station side of CSI-RS resource or columns are identical.If base station is from each column day
Line sends measurement pilot tone, then the columns of antenna of number and base station side of CSI-RS resource is identical；If base station is sent out from every row antenna
Measurement pilot tone is sent, then the line number of antenna of number and base station side of CSI-RS resource is identical.
Preferably, it is following several to determine that the mode of one group of channel state information has for processor 401:
The first, processor 401 is specifically used for:
The average value for calculating each channel matrix obtains equivalent channel matrix, is determined according to the equivalent channel matrix
Channel state information described in one group.
Second, processor 401 is specifically used for:
The average value for calculating each channel matrix obtains equivalent channel matrix, is calculated according to each channel matrix
The corresponding order of each CSI-RS resource is obtained, the average value for calculating each order obtains average rank value, according to the equivalent channel
Matrix and the average rank value calculate and obtain pre-coding matrix instruction and channel quality information, by the average rank value, meter
It calculates the pre-coding matrix instruction obtained and the channel quality information is determined as one group of channel state information.
The third, processor 401 is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter selects a CSI-RS resource according to each special parameter and preset rules, calculates the described of selection
The corresponding one group of channel state information of CSI-RS resource is as the determining channel state information.
Preferably, in the third embodiment, processor 401 is specifically used for:
It determines the minimum value in each special parameter, one is selected from the corresponding CSI-RS resource of the minimum value
CSI-RS resource；
Alternatively,
It determines the maximum value in each special parameter, one is selected from the corresponding CSI-RS resource of the maximum value
CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, in the third embodiment, the transceiver 403 is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
Preferably, more than two CSI-RS resource are divided into two groups by processor 401, corresponding according to every group of CSI-RS resource
Each of the channel matrix determine every group of respective intermediate parameters of CSI-RS resource, according to the respective institute of every group of CSI-RS resource
It states intermediate parameters and determines the corresponding one group of channel state information of every group of CSI-RS resource, obtain two groups of channel state informations.
Specific implementation includes but is not limited to following several:
The first, processor 401 is specifically used for:
More than two CSI-RS resource are divided into two groups, calculate all CSI-RS that every group of CSI-RS resource respectively contains
The average value of the corresponding channel matrix of resource obtains every group of corresponding equivalent channel matrix of CSI-RS resource, according to
Every group of corresponding equivalent channel matrix of CSI-RS resource determines two groups of channel state informations.
Second, processor 401 is specifically used for:
Described two above CSI-RS resource are divided into two groups, calculate that every group of CSI-RS resource respectively contain is all
The average value of the corresponding channel matrix of CSI-RS resource obtains the corresponding equivalent channel square of every group of CSI-RS resource
Battle array；
It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS
The average value for each order that resource respectively contains obtains the corresponding average rank value of every group of CSI-RS resource；
It is obtained according to the respective equivalent channel matrix of every group of CSI-RS resource and the respective average rank value, calculating
Obtain the corresponding pre-coding matrix instruction of every group of CSI-RS resource and the channel quality information；
According to the corresponding average rank value of every group of CSI-RS resource, pre-coding matrix instruction and the channel matter
Information is measured, determines two groups of channel state informations.
The third, processor 401 is specifically used for:
Respectively according to each channel matrix, calculates and obtain in the corresponding channel state information of each CSI-RS resource
Special parameter；
Described two above CSI-RS resource are divided into two groups；
It is directed to every group of CSI-RS resource respectively, according to the corresponding each special parameter of this group of CSI-RS resource and in advance
If rule one CSI-RS resource of selection；
It calculates separately and each of selects the corresponding one group of channel state information of the CSI-RS resource as determining two groups
The channel state information.
Preferably, in the third embodiment, processor 401 is specifically used for:
It determines the minimum value in each special parameter, one is selected from the corresponding CSI-RS resource of the minimum value
CSI-RS resource；
Alternatively,
It determines the maximum value in each special parameter, one is selected from the corresponding CSI-RS resource of the maximum value
CSI-RS resource.
Preferably, the special parameter is order or channel quality information.
Preferably, in the third embodiment, transceiver 403 is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
Based on the above-mentioned technical proposal, in the embodiment of the present invention, terminal is obtaining multiple corresponding letters of CSI-RS resource
After road matrix, intermediate parameters are determined according to each channel matrix, determine one group or two groups of channel status letters according to the intermediate parameters
Breath, is sent to base station for determining this group or two groups of channel state informations, thus in the case where there is multiple CSI processes, only
One group or two groups of channel state informations, which need to be fed back, reduces feedback overhead to base station, and reduces the computation complexity of base station.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of channel state information feedback method characterized by comprising
Terminal obtains more than two corresponding channel matrixes of channel state information reference signals CSI-RS resource；
The terminal determines intermediate parameters according to each channel matrix, determines one group or two groups of letters according to the intermediate parameters
Channel state information, channel state information described in every group include order, pre-coding matrix instruction and channel quality information；
Described one group or two groups of channel state informations are sent to base station by the terminal；
Wherein, the terminal determines intermediate parameters according to each channel matrix, determines one group of letter according to the intermediate parameters
Channel state information, comprising:
The average value that the terminal calculates all channel matrixes obtains equivalent channel matrix, according to each channel matrix
It calculates and obtains the corresponding order of each CSI-RS resource, the average value for calculating each order obtains average rank value, according to described equivalent
Channel matrix and the average rank value calculate and obtain pre-coding matrix instruction and channel quality information, by the average order
Value, the pre-coding matrix instruction for calculating acquisition and the channel quality information are determined as one group of channel status letter
Breath；Or,
The terminal calculates respectively according to each channel matrix and obtains the corresponding channel state information of each CSI-RS resource
In special parameter, select a CSI-RS resource according to each special parameter and preset rules, calculate the institute of selection
The corresponding one group of channel state information of CSI-RS resource is stated as the determining channel state information；
Wherein, the terminal determines intermediate parameters according to each channel matrix, determines two groups of letters according to the intermediate parameters
Channel state information, comprising:
Described two above CSI-RS resource are divided into two groups by the terminal, calculate the institute that every group of CSI-RS resource respectively contains
There is the average value of the corresponding channel matrix of CSI-RS resource, obtains the corresponding equivalent channel square of every group of CSI-RS resource
Battle array；It is calculated according to each channel matrix and obtains the corresponding order of each CSI-RS resource, calculate separately every group of CSI-RS resource
The average value of all orders respectively contained obtains the corresponding average rank value of every group of CSI-RS resource；According to every group of CSI-RS
The respective equivalent channel matrix of resource and the respective average rank value, it is respectively right to calculate every group of CSI-RS resource of acquisition
The pre-coding matrix instruction answered and the channel quality information；According to the corresponding average order of every group of CSI-RS resource
Value, pre-coding matrix instruction and the channel quality information, determine two groups of channel state informations；Or,
The terminal calculates respectively according to each channel matrix and obtains the corresponding channel state information of each CSI-RS resource
In special parameter；Described two above CSI-RS resource are divided into two groups by the terminal；The terminal is directed to every group respectively
CSI-RS resource selects a CSI-RS according to the corresponding each special parameter of this group of CSI-RS resource and preset rules
Resource；The terminal, which calculates separately, each of selects the corresponding one group of channel state information of the CSI-RS resource as determining
Channel state information described in two groups.
2. the method as described in claim 1, which is characterized in that described to be selected according to each special parameter and preset rules
Select a CSI-RS resource, comprising:
The terminal determines the minimum value in each special parameter, selects from the corresponding CSI-RS resource of the minimum value
One CSI-RS resource；
Alternatively,
The terminal determines the maximum value in each special parameter, selects from the corresponding CSI-RS resource of the maximum value
One CSI-RS resource.
3. the method as described in claim 1, which is characterized in that the special parameter is order or channel quality information.
4. the method as described in claim 1, which is characterized in that the method also includes:
The mark of the CSI-RS resource of selection is sent to the base station by the terminal.
5. a kind of terminal characterized by comprising
Module is obtained, for obtaining the corresponding channel square of more than two channel state information reference signals CSI-RS resource
Battle array；
Determining module, for determining intermediate parameters according to each of the acquisition module acquisition channel matrix, according to described
Intermediate parameters determine that one group or two groups of channel state informations, channel state information described in every group include order, pre-coding matrix instruction
And channel quality information；
Sending module, for described one group of determining module determination or two groups of channel state informations to be sent to base station；
Wherein, the determining module is specifically used for:
The average value for calculating all channel matrixes obtains equivalent channel matrix, is calculated and is obtained according to each channel matrix
The corresponding order of each CSI-RS resource, the average value for calculating each order obtains average rank value, according to the equivalent channel matrix
And the average rank value calculates and obtains pre-coding matrix instruction and channel quality information, by the average rank value, calculates and obtains
The pre-coding matrix instruction and the channel quality information obtained is determined as one group of channel state information；Or,
Respectively according to each channel matrix, calculate specific in the corresponding channel state information of each CSI-RS resource of acquisition
Parameter selects a CSI-RS resource according to each special parameter and preset rules, calculates the CSI-RS of selection
The corresponding one group of channel state information of resource is as the determining channel state information；
Wherein, the determining module is specifically used for:
Described two above CSI-RS resource are divided into two groups, calculate all CSI-RS that every group of CSI-RS resource respectively contains
The average value of the corresponding channel matrix of resource obtains every group of corresponding equivalent channel matrix of CSI-RS resource；According to
Each channel matrix, which calculates, obtains the corresponding order of each CSI-RS resource, calculates separately every group of CSI-RS resource and respectively contains
All orders average value, obtain the corresponding average rank value of every group of CSI-RS resource；Respectively according to every group of CSI-RS resource
The equivalent channel matrix and the respective average rank value, calculate and obtain that every group of CSI-RS resource is corresponding to prelist
The instruction of code matrix and the channel quality information；According to the corresponding average rank value of every group of CSI-RS resource, prelist
The instruction of code matrix and the channel quality information, determine two groups of channel state informations；Or,
Respectively according to each channel matrix, calculate specific in the corresponding channel state information of each CSI-RS resource of acquisition
Parameter；Described two above CSI-RS resource are divided into two groups；It is directed to every group of CSI-RS resource respectively, according to this group of CSI-RS
The corresponding each special parameter of resource and preset rules select a CSI-RS resource；
It calculates separately and each of selects the corresponding one group of channel state information of the CSI-RS resource as described in determining two groups
Channel state information.
6. terminal as claimed in claim 5, which is characterized in that the determining module is specifically used for:
It determines the minimum value in each special parameter, a CSI- is selected from the corresponding CSI-RS resource of the minimum value
RS resource；
Alternatively,
It determines the maximum value in each special parameter, a CSI- is selected from the corresponding CSI-RS resource of the maximum value
RS resource.
7. terminal as claimed in claim 5, which is characterized in that the special parameter is order or channel quality information.
8. terminal as claimed in claim 5, which is characterized in that the sending module is also used to:
The mark of the CSI-RS resource of selection is sent to the base station.
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| CN103378896A (en) * | 2012-04-23 | 2013-10-30 | 马维尔国际有限公司 | Method and apparatus for determining channel state information |
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| CN102412885A (en) * | 2011-11-25 | 2012-04-11 | 西安电子科技大学 | Three-dimensional wave beam forming method in long term evolution (LET) |
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