CN106685502A - Quantitative CSI (Channel State Information) feedback method and terminal - Google Patents
Quantitative CSI (Channel State Information) feedback method and terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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Abstract
The invention relates to a quantitative CSI feedback method and a terminal. The terminal obtains configuration information of a channel measurement pilot frequency and the CSI feedback type sent by a base station, the configuration information of the channel measurement pilot frequency comprises K sets of pilot-frequency configuration information, and K>=1; and the terminal determines a quantitative CSI feedback method according to a value of K and the configuration information of the CSI feedback type, and quantitative CSI feedback is carried out according to the quantitative CSI feedback method. The terminal comprises a quantitative CSI feedback device, and the quantitative CSI feedback device comprises an information obtaining module and a quantitative feedback module. CSI feedback of FDD and TDD can be realized via unified configuration, and a CQI calculation method and CSI report content are determined according to the value of K.
Description
Technical field
The present invention relates to a kind of channel information in wireless communication field, more particularly to multiaerial system quantifies feedback method
And terminal.
Background technology
In wireless communication system, transmitting terminal and receiving terminal take the mode of spatial reuse higher to obtain using many antennas
Speed.Relative to general method for spacial multiplex, a kind of enhanced technology is that receiving terminal feeds back to transmitting terminal channel information, is sent out
Sending end, using transmitting precoding technique, can be greatly enhanced transmission performance according to the channel information for obtaining.It is many for single user
In input multi output (SU-MIMO, MIMO therein represents Multi-input Multi-output, multiple-input and multiple-output), directly
Connect carries out precoding using channel characteristics Vector Message；For in multiuser MIMO (MU-MIMO), more accurately channel is needed
Information.Some are described below with base station side channel condition information (CSI：Channel state information, including
Channel parts and interference parts) acquisition, the end side CSI quantization related substances of feedback.
FDD system presently, there are following several typical CSI feedback scenes and corresponding feedback technique；
CSI feedback scene 1：Base station can not obtain CSI feedback during letter state road information by reciprocity.
Such case is relatively common in FDD system, some base station systems, it is impossible to obtain down channel by reciprocity
Information, needs to be measured by CSI feedback.Because the antenna dimension for considering to support is little, generally less than equal to 8, channel measurement is led
Frequency and CSI feedback expense can receive, and for simplicity, employ measurement and the CSI feedback of full dimension.The LTE of such as early stage
FDD mainly considers this scene in version, and using the pilot tone and CSI feedback of full dimension, it is implicit feedback to feed back by the way of, first
First, base station sends a set of channel measurement pilot frequency to terminal, and terminal carries out channel measurement based on the pilot tone and CSI quantifies feedback, such as
Shown in Fig. 1.
In general the content of CSI mainly includes (RI/PMI/CQI)：Channel quality indication (CQI) information (Channel
Quality indication, referred to as CQI), precoding matrix indicators (Precoding Matrix Indicator, letter
Referred to as PMI) and order designator (Rank Indicator, referred to as RI).CQI is a finger for weighing down channel quality quality
Mark.CQI can be understood as a kind of quantization of Signal to Interference plus Noise Ratio SINR, and 0～15 integer values of CQI are come table in 36-213 agreements
Show, different CQI grades are represented respectively, and different CQI correspond to respective modulation system and encoder bit rate (MCS).RI is used for
The number of description space independent channel, the order of respective channels response matrix.Under space multiplexing mode, UE feedback RI letters are needed
Breath, need not feed back RI information under other patterns.The sum of ranks number of plies correspondence of channel matrix.PMI feedbacks are optimal precoding letters
Breath, based on index feedback, most matches the code word of the feature of present channel in the code book for indicating agreement.
With technology develop, number of antennas increase and considers 3D MIMO application after, employ more complicated measurement and
Feedback technique, including：Base station sends N set pilot tones and carries out channel condition information measurement, N >=2 to terminal.Terminal selects therein one
Set pilot tone, and report CRI (CSI-RS Resource Index, channel measurement pilot frequency resource index) to base station, terminal is based on choosing
The channel measurement pilot frequency selected reports RI/PMI/CQI；This mode can select optimal CSI-RS resource to measure
(can be understood as a part for feedback of channel information), in conjunction with traditional CSI feedback, base station can be by CRI and traditional C/S I
Feedback obtains total channel information, as shown in Figure 2.One kind typical case's application of the technology is exactly vertical sector Intel Virtualization Technology, base
Stand and the wave beam of different directions is generated using different precodings, cover different vertical direction；UE selects optimal precoding to lead
Frequently (vertical beam), and then horizontal dimensions CSI feedback is carried out based on the precoded pilot.Precoded pilot of the base station based on terminal
(vertical beam) select information report and horizontal dimensions CSI feedback, with reference to the weights that precoded pilot is used, compared
More complete channel condition information.
CSI feedback scene 2：Base station can obtain CSI feedback during channel segment information by FDD reciprocities.
The situation of the incomplete channel information acquisition of FDD system：For some scatterings are not very abundant letters in FDD system
Road, can estimate up channel by uplink SRS pilot tone, and partial channel knowledge is obtained after some process, and then utilize
This partial channel knowledge generates precoded pilot, and terminal carries out channel measurement by precoded pilot, further feedback CSI letters
Breath.For FDD system, reciprocity is to carry out channel reciprocity over different frequencies, due to technology restriction, can always bring error
The information of relatively coarse channel strip can only be obtained in other words, it is desired nonetheless to feed back RI/PMI/CQI, but due to base station
A part of channel information is obtained by reciprocity, the dimension of PMI has significantly reduction；As shown in Figure 3.
This method, general base station is located by the characteristic vector that the reciprocity of channel covariance matrices can obtain channel
Subspace, but accurate characteristic vector cannot be known, therefore one group of base vector (wave beam) conduct of the subspace can be used
The precoding of pilot tone, terminal further reports more accurately CSI information by measuring the precoded pilot.
As described previously for FDD system, current CSI measurements and the standardized technique for feeding back define following feedback method：
Base station can configure K and cover pilot tone to terminal, and K is positive integer；Work as K>When 1, terminal is according to carrying out CSI-RS pilot tone selections shown in Fig. 2
Quantify to feed back with RI/PMI/CQI；As K=1, if dimensionality reduction precoded pilot, flow process is as shown in figure 3, base station can configure
Targetedly being adapted to the code book of dimensionality reduction feedback carries out CSI quantization feedbacks, if traditional quantization feedback side as shown in Figure 1
Formula, then can configure traditional code book carries out the quantization feedback of CSI.
The CSI feedback application scenarios of TDD system and feedback technique：
From unlike FDD system, base station can estimate up channel to TDD by up SRS pilot tones, pass through then
Reciprocity obtains descending channel information；Because TDD system channel reciprocity is carried out on the same frequencies, it is believed that
The information of good channel strip is obtained, the main CSI information for expecting to obtain is interference sections information；Interference sections information master
To be reflected by CQI；In general, in order to reduce complexity, FDD system and TDD system should use identical framework
(framework) carry out the quantization feedback of CSI, traditional TDD CSI measurements feedback technique mainly consider with Fig. 1
Framework, with FDD consideration is designed for uniformity, and differs primarily in that following two aspects：
Difference 1：Terminal is employed and reported based on the CQI of transmission diversity TxD；
Because terminal does not report PMI, it is impossible to assume to be transmitted using the PMI that reports, so carry out CQI calculating and on
Report, it is therefore assumed that the mode based on transmission diversity carries out CQI calculating and reports；Because base station can obtain accurate channel square
Battle array H, can be converted into using corresponding SINR during optimum precoding based on H and transmission diversity mode CQI.
Difference 2：Without RI and PMI information, need one to signal PMI/RI I and do not enable (diabling).
But, for the new CSI measurement feedback framework shown in Fig. 2 and Fig. 3, FDD system is mainly considered, lack
The Uniting of few targetedly TDD feedbacks considers.Therefore have impact on the performance of TDD system (including feedback overhead and link certainly
Adapt to).In addition, the CQI feedback based on TxD can not well be applied to various scenes；CQI is calculated in the way of transmission diversity,
Error can be brought during its conversion, is converted due to being not based on perfect linear relationship, this conversion under some scenes
Obvious performance loss can be brought.
The content of the invention
In view of this, the invention provides technical scheme below.
A kind of quantization feedback method of channel condition information CSI, including：
Terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, and the channel measurement is led
The configuration information of frequency includes that K covers the configuration information of pilot tone, K >=1；
The terminal determines that CSI quantifies feedback method according to the value and CSI feedback type configuration information of K, and according to institute
Stating CSI quantization feedback methods carries out CSI quantization feedbacks.
A kind of terminal, including channel condition information CSI quantization feedback devices, it is characterised in that the CSI quantifies feedback dress
Put including：
Data obtaining module, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, institute
Stating the configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1；
Quantify feedback module, for determining that CSI quantifies feedback method according to the value of K and CSI feedback type configuration information,
And carry out CSI quantization feedbacks according to CSI quantization feedback methods.
CSI feedback of the such scheme for FDD and TDD can utilize unified framework to realize, can according to the value of K come
Judge the content that the computational methods and CSI of CQI are reported.
In view of this, present invention also offers technical scheme below.
A kind of method of determination channel quality indication (CQI) information CQI, including：
Terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, and the channel measurement is led
The configuration information of frequency includes that K covers the configuration information of pilot tone, K >=1；
The terminal represents that pre-coding matrix index PMI is not enabled in the configuration information of the CSI feedback type, and K=1
When, calculate CQI using agreement and/or the pre-coding matrix for configuring.
A kind of terminal, including CQI determining devices, it is characterised in that the CQI determining modules include：
Data obtaining module, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, institute
Stating the configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1.
CQI computing modules, for representing that pre-coding matrix index PMI does not make in the configuration information of the CSI feedback type
Can, and during K=1, using agreement and/or the pre-coding matrix for configuring CQI is calculated.
Such scheme calculates CQI by agreement and/or the pre-coding matrix for configuring, can be in the way of obtaining than transmission diversity
Calculate CQI better performances.
Description of the drawings
Fig. 1 is the schematic diagram of the full Vc SI measurements of FDD system and feedback；
Fig. 2 is the schematic diagram of the CSI feedback that FDD system is selected based on measurement pilot tone；
Fig. 3 is schematic diagram of the FDD system based on the CSI feedback of dimensionality reduction precoded pilot；
Fig. 4 is the flow chart that the CSI of the embodiment of the present invention one quantifies feedback method method；
Fig. 5 is the module map that CSI quantifies feedback device in the terminal of the embodiment of the present invention one；
Fig. 6 is the schematic diagram of candidate's pattern of CSI-RS position；
Fig. 7 is the flow chart of the method that the embodiment of the present invention two determines CQI；
Fig. 8 is the module map of CQI determining devices in the terminal of the embodiment of the present invention two.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Embodiment one
A kind of quantization feedback method of channel condition information CSI is present embodiments provided, as shown in figure 4, including：
Step 110, terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the letter
The configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1；
In this step, the configuration information of the CSI feedback type includes：Represent pre-coding matrix index PMI enable or
The information not enabled.For example, to FDD system, PMI enables are configured to；To TDD system, it is configured to PMI and does not enable.But the present invention
It is not limited to this.
The configuration of the channel measurement pilot frequency is obtained in the channel measurement pilot frequency configuration signal that terminal can send from base station
Information, obtains the configuration information of the CSI feedback type in the CSI feedback type configuration signaling sent from base station.
Step 120, the terminal determines that CSI quantifies feedback method according to the value and CSI feedback type configuration information of K,
And carry out CSI quantization feedbacks according to CSI quantization feedback methods.
In this step, when the CSI feedback type configuration information represents that PMI is not enabled, the terminal according to the value of K and
The CSI that CSI feedback type configuration information determines quantifies feedback method can be included：
During K=1, using agreement and/or the pre-coding matrix for configuring CQI is calculated；
K>When 1, CQI is calculated based on the mode of transmission diversity；Or using single antenna port direct measurement CQI.
Wherein, the use agreement and/or the pre-coding matrix calculating CQI of configuration such as can be according to orders RI and letter for using
Channel measurement pilot frequency CSI-RS ports, select one or more pre-coding matrixes from the codebook subset arranged and/or configure, each
Individual precoding square is used to calculate one or more CQI.CQI is calculated relative to the mode based on transmission diversity, this calculating CQI's
Mode performance under application scenes is more preferable.
In this step, when the CSI feedback type configuration information represents that PMI is not enabled, the terminal according to the value of K and
The CSI that CSI feedback type configuration information determines quantifies feedback method can be included：
During K=1, RI and CQI is fed back.
K>When 1, CRI and CQI is fed back.
In this step, when the CSI feedback type configuration information represents that PMI is not enabled, value of the terminal according to K
Quantifying feedback method with the CSI that CSI feedback type configuration information determines can include：
During K=1, fed back using the feedback model not comprising PMI；
K>When 1, fed back using the feedback model comprising PMI.
The present embodiment additionally provides a kind of terminal, including channel condition information CSI quantifies feedback device, as shown in figure 5, institute
Stating CSI quantization feedback devices includes：
Data obtaining module 10, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type,
The configuration information of the channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1.Wherein, the CSI feedback type is matched somebody with somebody
Confidence breath includes：Represent the information that pre-coding matrix index PMI is enabled or do not enabled.
Quantify feedback module 20, for determining that CSI quantifies feedback side according to the value of K and CSI feedback type configuration information
Method, and carry out CSI quantization feedbacks according to CSI quantization feedback methods.
Alternatively,
The quantization feedback module 20 represents that PMI is not enabled in CSI feedback type configuration information, and during K=1, according to K's
The CSI that value and CSI feedback type configuration information determine quantifies feedback method to be included：Using agreement and/or the precoding for configuring
Matrix computations CQI.Wherein, it is described to be included using agreement and/or the pre-coding matrix for configuring calculating CQI：According to what is used
Order RI and channel measurement pilot frequency CSI-RS ports, select one or more precodings from the codebook subset arranged and/or configure
Matrix, each precoding square is used to calculate one or more CQI.
Alternatively,
The quantization feedback module 20 represents that PMI is not enabled in CSI feedback type configuration information, and K>When 1, according to K's
The CSI that value and CSI feedback type configuration information determine quantifies feedback method to be included：CQI is calculated based on the mode of transmission diversity；
Or, using single antenna port direct measurement CQI.
Alternatively,
It is anti-according to the value and CSI of K when the quantization feedback module CSI feedback type configuration information represents that PMI is not enabled
The CSI that feedback type configuration information determines quantifies feedback method to be included：
During K=1, RI and CQI is fed back.
K>When 1, CRI and CQI is fed back.
Alternatively,
It is anti-according to the value and CSI of K when the quantization feedback module CSI feedback type configuration information represents that PMI is not enabled
The CSI that feedback type configuration information determines quantifies feedback method to be included：
During K=1, fed back using the feedback model not comprising PMI；
K>When 1, fed back using the feedback model comprising PMI.
CSI feedback of the present embodiment for FDD and TDD can utilize unified framework to realize, can according to the value of K come
Judge the content that the computational methods and CSI of CQI are reported.
It is given below and is illustrated based on some examples of embodiment one.
Example one
This example is illustrated to the configuration information of channel measurement pilot frequency.
Base station sends the configuration information of K sets channel measurement pilot frequency (CSI-RS) to terminal, and issuing for the configuration information can be with
By high-level signaling.The resource location that base station indicates in configuration information sends the K and covers pilot tone.
Base station can configure one or more sets pilot tones to terminal, include the cycle information of every set pilot tone, sequence information, son
The running time-frequency resource position pattern of frame in, sub-frame offset information etc.；As shown in fig. 6, supporting most 58 ends of polygamy in same subframe
Pattern #0, #1, #2, #3, #4, the #5 of mouth, if 4 port patterns of configuration can configure 10,2 port patterns can configure 20
It is individual；DMRS therein is demodulated reference signal (De Modulation Reference Signal), and CSRS is the proprietary ginseng of cell
Examine signal (Cell-specific reference signals).
If it is considered that different sub-frame offset situations, it is assumed that the cycle of configuration is 5ms, then can have 5 kinds of sub-frame offsets
Optional, on the basis of original configurable pilots, the maximum occurrences of K can increase by 500, if configuration cycle be 10ms and
More than, pilot tone tricks K that can be configured can be some more.
Base station is according to the cycle information for configuring, sequence information, the running time-frequency resource position pattern in subframe, sub-frame offset information
K set CSI-RS pilot tones are sent respectively.
The configuration signal that terminal detection base station sends, obtains the related positional information of pilot tone and sequence information, then can be with
The pilot signal for receiving is detected in corresponding position；Sequence letter is sent using the pilot signal for receiving and the pilot tone known
Breath, can carry out channel estimation, obtain channel matrix H.
Example two
Originally illustrate when CSI feedback type configuration information indicates that PMI is not enabled, terminal judges CQI based on the value of K
Calculation.
The selection of CQI calculations typically assumes that a kind of descending transmission technology that may be adopted, and estimates in the transmission
Technology is employed, and data is activation reaches receiving terminal, the Signal to Interference plus Noise Ratio after receiver through channel；Then make an uproar according to the letter is dry
Than judging that channel quality such as selects corresponding CQI grades.Selected CQI grades, should cause descending corresponding to the CQI
Block Error Rate of the data channel transmission block under corresponding modulation coding mode is less than 0.1；It is as shown in the table, each CQI sequence number
A kind of modulation system and code check are corresponded to.
Table 1:4 bit CQI forms
In this example, in K>When 1, terminal selects wherein a set of pilot tone, and the mode using transmission diversity to carry out on CQI
Report.So-called transmission diversity mode, that is, assume that the data for carrying out Space Time Coding or space-frequency coding in the enterprising step of pilot frequency port are passed
The diversity mode of defeated, or space-time/frequency coding+frequency domain antenna switching, when then under this assumption estimated data is transmitted
Transmission quality, i.e. SINR, by the size of SINR can by pre-set link curve corresponding relation (SINR, CQI,
BLER relations) obtain a CQI for quantifying.In another example, in K>When 1, terminal can directly be surveyed using single antenna port
Amount CQI.
In this example, during K=1, terminal can be based on the mode of precoding transmissions and carry out CQI calculating, such as：
Mode one：CQI is calculated using a pre-coding matrix of agreement.Terminal and base station can adopt the pre- of following table agreement
Encoder matrix, it is current using corresponding in the codebook subset (including all pre-coding matrixes assumed and use are represented) arranged in table
Order RI for using and a pre-coding matrix of channel measurement pilot frequency CSI-RS ports calculate CQI.
When calculating CQI using a pre-coding matrix, a CQI can be calculated, it is also possible to calculate multiple CQI as many in calculated
The CQI of individual subband.
Mode two：The pre-coding matrix configured using base station calculates CQI.
The configuration signal of base station can select signaling or codebook subset limitation signaling using codebook subset；Code book
It is a kind of codebook configuration signaling that collection limits Codebook subset restriction (CSR), it is also possible to referred to as codebook subset choosing
Codebook Subset Selection are selected, is referred to and the codeword set of a UE is limited in a big codebook set lining collection
Close, so according to the channel characteristics of UE the codebook subset for being adapted to the UE can be selected to close or reduce the code of the interference to other UE
This subclass, can reduce the codebook selecting complexity of UE, reduce the expense of code book feedback, limit the direction of UE wave beams.Here
With the signaling for the combination of every kind of RI and CSI-RS ports configures a code word for CQI calculating；When in this way,
Due to PMI only have it is a kind of unique select, therefore can specify that and do not report PMI；
Mode three：The combination of mode one and mode two, such as some CSI-RS ports configurations such as 2 ports, using agreement
Mode, for other CSI-RS ports configurations such as 4 ports, using base station configuration mode.It is as shown in the table：
Although above example is to calculate CQI from a pre-coding matrix, in other examples, it is also possible to from multiple
Calculating CQI, each pre-coding matrix can be used for calculating one or more CQI (such as 2) pre-coding matrix.Accordingly
Ground, the CQI of terminal feedback is also to correspond respectively to multiple pre-coding matrixes, and base station can determine according to the agreement with terminal
The corresponding relation of CQI and pre-coding matrix.
Example three
Originally illustrate CSI feedback type configuration information and indicate PMI when not enabling, terminal judges CSI based on the value of K
The CSI types of feedback.
Such as in periodic feedback, if configuration K=1, when PMI is not enabled, carries out in such a way periodic feedback；
RI, CQI, CQI ... ..., RI, CQI, CQI ... ...
Wherein, RI is the rank information recommended based on the CSI-RS pilot tones, and CQI is according to agreement or configuration based on CSI-RS
The calculated channel quality information of precoding mode.
If configuration K>1, PMI then carries out in such a way periodic feedback when not enabling；
CRI, CQI, CQI ... ..., CRI, CQI, CQI ... ...
Wherein, CRI is the CSI-RS resource information based on many set CSI-RS pilot measurement final choices, and CQI is base
In select CSI-RS according to transmission diversity the calculated channel quality information of hypothesis；
Non-periodic feedback also may be used.
Example four
Originally illustrate when CSI feedback type configuration information indicates that PMI is not enabled, value of the terminal based on K judges anti-
Feedback pattern；
Feedback model (feedback mode) refers to the instructing combination that CSI (CQI/PMI/RI) feeds back, including subband feedback
With broadband feedback or select M subband feedback etc., including periodic feedback and non-periodic feedback.Wherein, non-periodic feedback exists
Transmit in PUSCH, including following pattern：
For example, pattern (Mode) 2-0 represents the subband feedback selected based on UE, the pattern fed back without PMI, pattern 3-0
Represent based on the subband feedback of high-rise configuration, without the pattern of PMI feedbacks.Pattern 3-1, pattern 1-2, pattern 2-2, pattern 3-2
Represent the pattern comprising 1 or 2 PMI feedback.
Periodic feedback pattern refers to the pattern fed back in PUCCH periodically, and it includes following pattern：
Wherein, pattern (Mode) 1-0 represents bandwidth feedback, the pattern fed back without PMI, and pattern 2-0 is represented to be selected based on UE
The subband feedback selected, the pattern fed back without PMI.Pattern 1-1, pattern 2-1 represent the pattern comprising PMI feedbacks.
As K=1, base station and terminal can arrange to be fed back using the feedback model not comprising PMI, for example：PUSCH
Non-periodic feedback Mode 2-0, Mode 3-0；PUCCH periodic feedback Mode 1-0, Mode 2-0.
Work as K>When 1, base station and terminal can arrange to be fed back using the feedback model comprising PMI, even if now base station
It is configured with PMI and does not enable signaling, also needs to feed back PMI.
That is, during K=1, supporting that PMI is not enabled.But K>PMI does not enable signaling and can fail when 1, and terminal is understood as needs
Report PMI,
Embodiment two
The present embodiment provides a kind of method of determination channel quality indication (CQI) information CQI, as shown in fig. 7, comprises：
Step 210, terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the letter
The configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1；
The configuration information of the CSI feedback type includes：Represent the letter that pre-coding matrix index PMI is enabled or do not enabled
Breath.For example, to FDD system, PMI enables are configured to；To TDD system, it is configured to PMI and does not enable.But the present invention is not limited to this.
The configuration of the channel measurement pilot frequency is obtained in the channel measurement pilot frequency configuration signal that terminal can send from base station
Information, obtains the configuration information of the CSI feedback type in the CSI feedback type configuration signaling sent from base station.
Step 220, the terminal represents that pre-coding matrix index PMI does not make in the configuration information of the CSI feedback type
Can, and during K=1, using agreement and/or the pre-coding matrix for configuring CQI is calculated.
It is described to calculate CQI using agreement and/or the pre-coding matrix for configuring in this step, including：According to order RI for using
With channel measurement pilot frequency CSI-RS ports, one or more pre-coding matrixes are selected from the codebook subset arranged and/or configure,
Each precoding square is used to calculate one or more CQI.The codebook subset of the configuration can be that terminal sends from base station
Obtain in code book limitation signaling.
Above-mentioned CSI-RS ports can be configured by base station, it is also possible to be selected by terminal.RI can be selected but not office by terminal
It is limited to this.
The present embodiment also provides a kind of terminal, including CQI determining devices, as shown in figure 8, the CQI determining modules include：
Data obtaining module 50, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type,
The configuration information of the channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1.
CQI computing modules 60, for representing pre-coding matrix index PMI not in the configuration information of the CSI feedback type
Enable, and during K=1, using agreement and/or the pre-coding matrix for configuring CQI is calculated.For example, can according to order RI that uses and
Channel measurement pilot frequency CSI-RS ports, select one or more pre-coding matrixes, often from the codebook subset arranged and/or configure
One precoding square is used to calculate one or more CQI.
Alternatively, described information acquisition module is additionally operable to obtain the configuration in the code book limitation signaling sent from base station
Codebook subset.
Terminal calculates CQI to be needed to assume a kind of transmission technology, such as precoding transmissions technology, but precoding transmissions technology
In, different precoding weights have diverse performance, and in the case where there is PMI to feed back, terminal typically can be assumed to use
Be feedback the corresponding precodings of PMI, PMI is fed back to behind base station, and the CQI that base station also can know feedback is according to should
The corresponding precodings of PMI carry out calculating acquisition.But in certain situation, such as TDD system, the not feedback of PMI, therefore
Terminal can in the following ways obtain precoding weights and carry out CQI calculating：
Mode one：
Base station indicates that UE calculates the precoding weights that CQI is used by signal deployment；In the prior art, existed
Code book limitation signaling (for exist code book feed back when code word limit, but PMI feedback overheads not with effective code word quantity become
Change and change, without the need for configuration when feeding back without PMI) it is exactly a kind of good approach.When feeding back without PMI, code book is also introduced into
Limitation signaling is used to indicate the calculating of CQI that one code word of configuration to be (pre- under the corresponding code book of each combination of RI and CSI-RS ports
Encoder matrix) for CQI measurements, it is of course also possible to be multiple code words, each code word can be used for the measurement of one or more CQI,
But need not now feed back PMI.
Mode two：
Base station and terminal are arranged, and the corresponding code book of each combination of the RI and CSI-RS ports present in LTE protocol is adopted
It is used for the corresponding CQI measurements of the RI with a code word, it is of course also possible to be multiple, for the measurement of multiple CQI.
Mode three：The combination of mode one and mode two.
For three of the above mode, in the example two of embodiment one some examples are had been presented for.Here several codes are given again
The example of this subset：
Code word in such as LTE 2Tx code books：
Code word in such as LTE 4Tx code books：
The 4Tx code books (single PMI code books) of the definition of Release 8 of LTE, the value of total number of plies υ is that 1,2,3,4 primary key sheets are equal
The situation of only 1 index：
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.Embodiment party by more than
The description of formula, it is required general that those skilled in the art can be understood that above-described embodiment method can add by software
The mode of hardware platform is realizing, naturally it is also possible to by hardware, but in many cases the former is more preferably embodiment.It is based on
Such understanding, the part that the technical scheme of the embodiment of the present invention substantially contributes in other words to prior art can be with soft
The form of part product is embodied, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disc, CD)
In, including some instructions use is so that a station terminal equipment (can be mobile phone, computer, server, or network equipment etc.)
Perform the method described in each embodiment of the invention.
The preferred embodiments of the present invention are these are only, the scope of the claims of the present invention is not thereby limited, it is every using this
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (20)
1. a kind of quantization feedback method of channel condition information CSI, including：
Terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the channel measurement pilot frequency
Configuration information includes that K covers the configuration information of pilot tone, K >=1；
The terminal determines that CSI quantifies feedback method according to the value and CSI feedback type configuration information of K, and according to the CSI
Quantifying feedback method carries out CSI quantization feedbacks.
It is 2. as claimed in claim 1 to quantify feedback method, it is characterised in that：
The configuration information of the CSI feedback type includes：Represent the information that pre-coding matrix index PMI is enabled or do not enabled.
It is 3. as claimed in claim 2 to quantify feedback method, it is characterised in that：
The CSI feedback type configuration information represents that PMI is not enabled, and during K=1, the terminal is anti-according to the value and CSI of K
The CSI that feedback type configuration information determines quantifies feedback method to be included：
Channel quality indication (CQI) information CQI is calculated using agreement and/or the pre-coding matrix for configuring.
It is 4. as claimed in claim 3 to quantify feedback method, it is characterised in that：
It is described to calculate CQI using agreement and/or the pre-coding matrix for configuring, including：Order RI and channel measurement according to using is led
Frequency CSI-RS ports, select one or more pre-coding matrixes from the codebook subset arranged and/or configure, each precoding
Square is used to calculate one or more CQI.
5. the quantization feedback method as described in Claims 2 or 3 or 4, it is characterised in that：
The CSI feedback type configuration information represents that PMI is not enabled, and K>When 1, value and CSI feedback of the terminal according to K
The CSI that type configuration information determines quantifies feedback method to be included：
CQI is calculated based on the mode of transmission diversity；Or
Using single antenna port direct measurement CQI.
It is 6. as claimed in claim 2 to quantify feedback method, it is characterised in that：
The CSI feedback type configuration information represents that PMI is not enabled, value and CSI feedback type configuration of the terminal according to K
The CSI that information determines quantifies feedback method to be included：
During K=1, RI and CQI is fed back.
K>When 1, CRI and CQI is fed back.
7. the method as described in claim 3 or 4, it is characterised in that：
The CSI feedback type configuration information represents that PMI is not enabled, value and CSI feedback type configuration of the terminal according to K
The CSI that information determines quantifies feedback method to be included：
During K=1, fed back using the feedback model not comprising PMI；
K>When 1, fed back using the feedback model comprising PMI.
8. a kind of terminal, including channel condition information CSI quantifies feedback device, it is characterised in that the CSI quantifies feedback device
Including：
Data obtaining module, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the letter
The configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1；
Quantify feedback module, for determining that CSI quantifies feedback method according to the value of K and CSI feedback type configuration information, and press
Quantifying feedback method according to the CSI carries out CSI quantization feedbacks.
It is 9. as claimed in claim 8 to quantify feedback method, it is characterised in that：
The configuration information of the CSI feedback type includes：Represent the information that pre-coding matrix index PMI is enabled or do not enabled.
It is 10. as claimed in claim 9 to quantify feedback method, it is characterised in that：
The quantization feedback module represents that PMI is not enabled in CSI feedback type configuration information, and during K=1, according to the value of K and
The CSI that CSI feedback type configuration information determines quantifies feedback method to be included：Using agreement and/or the pre-coding matrix meter for configuring
Calculate CQI.
11. quantization feedback methods as claimed in claim 10, it is characterised in that：
It is described to calculate CQI using agreement and/or the pre-coding matrix for configuring, including：Order RI and channel measurement according to using is led
Frequency CSI-RS ports, select one or more pre-coding matrixes from the codebook subset arranged and/or configure, each precoding
Square is used to calculate one or more CQI.
The 12. quantization feedback methods as described in claim 9 or 10 or 11, it is characterised in that：
The quantization feedback module represents that PMI is not enabled in CSI feedback type configuration information, and K>When 1, according to the value of K and
The CSI that CSI feedback type configuration information determines quantifies feedback method to be included：CQI is calculated based on the mode of transmission diversity；Or,
Using single antenna port direct measurement CQI.
13. quantization feedback methods as claimed in claim 9, it is characterised in that：
It is described quantization feedback module when CSI feedback type configuration information represents that PMI is not enabled, according to the value and CSI feedback of K
The CSI that type configuration information determines quantifies feedback method to be included：
During K=1, RI and CQI is fed back.
K>When 1, CRI and CQI is fed back.
14. methods as described in claim 3 or 4, it is characterised in that：
It is described quantization feedback module when CSI feedback type configuration information represents that PMI is not enabled, according to the value and CSI feedback of K
The CSI that type configuration information determines quantifies feedback method to be included：
During K=1, fed back using the feedback model not comprising PMI；
K>When 1, fed back using the feedback model comprising PMI.
A kind of 15. methods of determination channel quality indication (CQI) information CQI, including：
Terminal obtains the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the channel measurement pilot frequency
Configuration information includes that K covers the configuration information of pilot tone, K >=1；
The terminal represents that pre-coding matrix index PMI is not enabled in the configuration information of the CSI feedback type, and during K=1,
CQI is calculated using agreement and/or the pre-coding matrix for configuring.
16. methods as claimed in claim 15, it is characterised in that：
It is described to calculate CQI using agreement and/or the pre-coding matrix for configuring, including：Order RI and channel measurement according to using is led
Frequency CSI-RS ports, select one or more pre-coding matrixes from the codebook subset arranged and/or configure, each precoding
Square is used to calculate one or more CQI.
17. methods as described in claim 15 or 16, it is characterised in that：
The codebook subset of the configuration is obtained in the code book limitation signaling that terminal sends from base station.
A kind of 18. terminals, including CQI determining devices, it is characterised in that the CQI determining modules include：
Data obtaining module, for obtaining the channel measurement pilot frequency of base station transmission and the configuration information of CSI feedback type, the letter
The configuration information of channel measurement pilot frequency includes that K covers the configuration information of pilot tone, K >=1.
CQI computing modules, for representing that pre-coding matrix index PMI is not enabled in the configuration information of the CSI feedback type, and
During K=1, using agreement and/or the pre-coding matrix for configuring CQI is calculated.
19. terminals as claimed in claim 18, it is characterised in that：
The CQI computing modules calculate CQI using agreement and/or the pre-coding matrix for configuring, including：According to order RI that uses and
Channel measurement pilot frequency CSI-RS ports, select one or more pre-coding matrixes, often from the codebook subset arranged and/or configure
One precoding square is used to calculate one or more CQI.
20. terminals as described in claim 15 or 16, it is characterised in that：
Described information acquisition module is additionally operable in the code book limitation signaling sent from base station obtain the codebook subset of the configuration.
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| CN201510751025.XA CN106685502A (en) | 2015-11-06 | 2015-11-06 | Quantitative CSI (Channel State Information) feedback method and terminal |
| PCT/CN2016/104645 WO2017076347A1 (en) | 2015-11-06 | 2016-11-04 | Method and terminal for use in quantized feedback of channel status information |
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| US8693421B2 (en) * | 2010-09-02 | 2014-04-08 | Texas Instruments Incorporated | Downlink 8 TX codebook sub-sampling for CSI feedback |
| CN103001676A (en) * | 2011-09-08 | 2013-03-27 | 上海交通大学 | Wireless communication method, user equipment and base station |
| CN104811229B (en) * | 2014-01-24 | 2020-09-08 | 中兴通讯股份有限公司 | Channel state information processing method and device, terminal and base station |
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