CN106411457A - Channel state information acquisition method, feedback method, base station, and terminal - Google Patents
Channel state information acquisition method, feedback method, base station, and terminal Download PDFInfo
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- CN106411457A CN106411457A CN201610040716.3A CN201610040716A CN106411457A CN 106411457 A CN106411457 A CN 106411457A CN 201610040716 A CN201610040716 A CN 201610040716A CN 106411457 A CN106411457 A CN 106411457A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0675—Space-time coding characterised by the signaling
- H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]
Abstract
The invention provides a channel state information acquisition method including that a transmitting end transmits a first detection signal and a second detection signal in at least one detection section; the channel state information based on the measurement of the first and second detection signals is received from a receiving end; and the channel state information includes one or more types of information including wave beam width information, adaptive quantification channel direction information, and predicted channel quality information. The invention further provides a channel state information feedback method, a base station, and a terminal. According to the invention, the signaling cost between the base station and the terminal for channel state information feedback can be reduced, and the base station can be prevented from obtaining ineffective channel state information.
Description
Technical field
The application is related to wireless communication technology field, more particularly, to channel state information acquisition method, feedback method, base station
And terminal.
Background technology
MIMO technique (Multiple-Input-Multiple-Output, referred to as MIMO) is by using sky
Between resource can exponentially improve the spectrum efficiency of wireless communication system, therefore become one of important technology of cellular communication.So
And, in order to obtain corresponding spectrum gain, transmitter must be known by channel direction information (Channel Direction
Information, referred to as CDI) to calculate precoding and to carry out other MIMO signal process.CDI is believed with channel quality
Breath (Channel Quality Information, referred to as CQI) constitutes complete channel condition information (Channel
State Information, referred to as CSI).For mimo system, transmitter obtains accurate CDI and is by closed loop
The prerequisite of MIMO transmission, is also the key of impact systematic function.
3G (Third Generation) Moblie partner program (3rd Generation Partnership Project, referred to as
Evolved Universal Terrestrial Radio Access (E-UTRA) agreement 3GPP) formulated is corresponding to be drilled for a long time
Entering (Long Term Evolution, referred to as LTE) system, according to the difference of dual-mode, has different CDI acquisition modes.
The dual-mode of LTE includes：Time division duplex (Time Division Duplexing, abbreviation TDD), and FDD
(Frequency Division Duplexing, abbreviation FDD).
In a tdd system, up channel and down channel have symmetry characteristic.Therefore, TDD base station is carried out to up channel
Channel estimation it is possible to obtain needed for down channel equivalent CDI.For assisted channel estimation, the detection of terminal transmission omnidirectional
Pilot signal (Sounding Reference Signal, referred to as SRS), it adopts specific pseudo-random sequence to generate, such as
Zadoff-Chu (ZC) sequence, and terminal and base station this sequence all known.TDD system is based on transmitting SRS and channel estimation mode
The disadvantage obtaining CDI is pilot pollution (pilot contamination) problem.In LTE system, same cell
The SRS that different terminals are allocated is orthogonal, and therefore base station can carry out glitch-free channel according to the SRS sequence of different terminals
Estimate, obtain the CDI of up channel.However, in LTE system, the SRS sequence that the terminal of different districts is allocated is nonopiate
In some instances it may even be possible to occur multiple terminals use identical SRS sequence situation, i.e. so-called SRS collision problem.In SRS conflict
When, base station is estimated also to receive the uplink SRS signal of other cell terminals while the up channel CDI of this cell terminal, because
This, this cell channel CDI that base station is estimated also aliasing channel CDI to this base station for other cell terminals.This phenomenon is claimed
For the pilot pollution problem.Pilot pollution all causes serious consequence to system uplink and downlink data transmission：1) when base station is to expectation
Terminal, when down channel sends data using the precoding having directivity, is pointed to the neighbor cell terminal on aliasing channel
Have sent the data of directivity and become serious presence of intercell interference；2) when base station utilizes in up channel to expectation terminal
Have directivity post processing receiving data when, the data of the neighbor cell terminal being pointed on aliasing channel has been also carried out enhancement
Process, thus be exaggerated the interference of aliasing channel.For above-mentioned reasons, the pilot pollution problem seriously constrains power system capacity.Special
It is not when antenna number increases, bottleneck easily in the lifting of systematic function.
Large-scale antenna array system (Large-scale MIMO, or Massive MIMO) was the 5th generation (5th
Generation, abbreviation 5G) cellular standards major candidate.Extensive antenna makes system using abundant signal
Process degree of freedom and terminal room interference and presence of intercell interference are greatly lowered, and computation complexity is low, can effectively improve communication link
Quality.In addition, extensive antenna can effectively reduce the power consumption of individual antenna unit, improve the energy dose-effect of whole system
Rate.Existing test has fully demonstrated the feasibility that base station configures tens of or even hundreds of antennas.A kind of in millimere-wave band
Specific implementation is：Base station by configuring large-scale antenna array, in antenna distance very little, using the phase place between antenna
Difference, forms extremely narrow launching beam and services multiple terminals；Meanwhile, terminal can also configure many antennas, to different arrival bearings
Form different gains, and the reception wave beam selecting gain larger carries out data receiver.If each launching beam clothes of base station
One terminal of business, then between terminal, interference is greatly lowered；If the launching beam service of adjacent base station different directions is respective
Terminal, then presence of intercell interference be greatly lowered.Theoretical analysis result shows, in extensive antenna system, if transmitter is known
Accurately terminal channel CDI, then uplink and downlink channel up to signal to noise ratio (signal-to-noise ratio, abbreviation SNR)
Increase with antenna number and increase；For tens of or even hundreds of transmitting antennas, power system capacity phase should be able to significantly improve.So
And, when there is the pilot pollution problem, the actual capacity of extensive antenna system but can seriously reduce, even if or even Base Transmitter
Power is relatively low, and whole system is also operated in interference-limited state.The pilot pollution problem for the impact of extensive antenna system is
Fatefulue.Therefore, the new CDI acquisition modes of design overcome the pilot pollution problem in extensive antenna system to lift system
Capacity means a great.
In FDD system, because uplink and downlink channel is in different frequency bands and does not have symmetry, it is right that base station cannot be passed through
Uplink channel estimation obtains down channel CDI.In this case, terminal must tie up a part of uplink channel resources will be descending
Channel CDI and CQI feedback are to base station.A kind of method is aobvious feedback, and down channel CDI is utilized fixed codebook to quantify and right by terminal
CQI carries out multi-level quantization, and quantized result is reported to base station by up channel；Another kind of method is hidden feedback, terminal
One desired precoding is selected from several fixing precodings according to down channel CDI, and by selection result and
CQI under selected CDI is reported to base station by up channel.In order to realize above method, base station needs by different CDI pair
Reference signal carries out precoding, and the different reference signal of terminal measurement is thus obtaining the signal intensity under corresponding CDI and judging
CQI.No matter adopted which kind of method, in FDD system in order that base station obtains sufficiently exact down channel CSI, system must be held
Two kinds of necessary expenses of load：Reference signal expense and feedback overhead.Meanwhile, two kinds of expenses all must increase with antenna for base station number
Plus and increase.And higher feedback quantization precision also implies that higher expense.This conclusion means that FDD system is based on instead
The mode that feedback obtains CDI faces the challenge how efficiently reducing expense in extensive antenna system.
The important problem of another one is, due to the error of CDI measurement and the time delay of feedback, how based on CDI under
Row data channel carries out precoding.If CDI feedback accuracy is poor and terminal is in the situation of high-speed mobile, under base station
Row data may deviate the channel direction of optimum, thus leading to systematic function to decline.
In sum, in 5G Communication System Design, the CDI acquisition problem of large-scale antenna array system is more urgent.
Design rapidly and effectively CDI acquisition methods, can be effectively reduced reference signal and the signaling consumption of system, avoid base simultaneously
The probability stood using wrong CDI it is ensured that the spectrum gain brought of extensive antenna, thus improving the power system capacity of cell.
Content of the invention
For this reason, this application provides a kind of acquisition methods of channel condition information, feedback method, base station and terminal, to subtract
Few signaling consumption, and avoid base station to obtain inactive channel status information.
A kind of channel state information acquisition method that the application provides includes：
Transmitting terminal sends the first detectable signal and the second detectable signal at least one detection interval；
Receive based on the channel status that the measurement of described first detectable signal and the second detectable signal is obtained from receiving terminal
Information；Wherein, described channel condition information includes one or more of following information：Beam angle information, adaptive quantizing
Channel direction information, prediction channel quality information.
Preferably, between the beam forming coefficients of described first detectable signal and the beam forming coefficients of the second detectable signal
There are differential relationship, the beam forming coefficients of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal
First half identical, the latter half of the beam forming coefficients of the second detectable signal is the beam shaping system of the first detectable signal
The opposite number of the latter half of number.
Preferably, the beam forming coefficients of described first detectable signal are：
The beam forming coefficients of the second detectable signal are：
Wherein, θprobFor the dispatching centre angle of the first detectable signal and the second detectable signal, N is the antenna of transmitting terminal
Number, d is the distance between antenna, and λ is wavelength；
The beam forming coefficients w1 of the first detectable signal is N-dimensional vector, and the nth elements of described N-dimensional vector areWherein 1≤n≤N；
The beam forming coefficients w2 of the second detectable signal is N-dimensional vector, the front N/2 element and first of described N-dimensional vector
The front N/2 element of the beam forming coefficients of detectable signal is identical, and rear N/2 element is the beam shaping system of the first detectable signal
The opposite number (respective element symbol is negated) of the rear N/2 element of number.
Preferably, described beam angle information can be obtained with beam shaping for transmitting terminal by using different antennae weight
One or more of width combination.
Preferably, the method also includes：Transmitting terminal adjusts antenna weight and makes the width sending wave beam be equal to described wave beam
The beam angle of width information instruction.
Preferably, the channel direction information of described adaptive quantizing includes quantified precision and based under this quantified precision
Channel direction information.
Preferably, the method also includes：Transmitting terminal is according to the quantization essence in the channel direction information of described adaptive quantizing
Degree, extracts channel direction information, and the channel direction that beam shaping center position be aligned is extracted.
Preferably, the channel quality information of described prediction adjusts, for transmitting terminal, the modulation that should use after beamforming patterns
Coded system.
Preferably, the method also includes：Transmitting terminal sends data according to described modulation coding mode.
Present invention also provides a kind of base station, including：Signal transmitting module and feedback reception module, wherein：
Signal transmitting module, for sending the first detectable signal and the second detectable signal at least one detection interval；
Feedback reception module, for receiving based on the survey to described first detectable signal and the second detectable signal from receiving terminal
The channel condition information measuring；Wherein, described channel condition information includes one or more of following information：Beam angle
Information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
Present invention also provides a kind of channel state information feedback method, including：
Receiving terminal receives the first detectable signal and the second detectable signal at least one detection interval；
Channel condition information is obtained based on described first detectable signal and the second detectable signal, and to transmitting terminal feedback channel
Status information；Wherein, described channel condition information includes one or more of following information：Beam angle information, self adaptation
The channel direction information quantifying, the channel quality information predicted.
Preferably, between the beam forming coefficients of described first detectable signal and the beam forming coefficients of the second detectable signal
There are differential relationship, the beam forming coefficients of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal
First half identical, the latter half symbol of the beam forming coefficients of the second detectable signal is that the wave beam of the first detectable signal becomes
The opposite number of the latter half of shape coefficient.
Preferably, the method also includes：Receiving terminal is received by measuring the first detectable signal and the second detectable signal
The mobile angular velocity at end, and according to channel quality and beam angle information described in mobile angular speed calculation.
Preferably, the method also includes：Receiving terminal chooses different quantization essences according to the SNR of reference signal with mobile angular velocity
Degree, and quantify to obtain described channel direction information according to the quantified precision chosen.
Preferably, the method also includes：Channel direction information and/or wave beam width that prediction transmitting terminal is fed back based on receiving terminal
After degree information is to the adjustment of beam forming coefficients, the modulation coding mode that transmitting terminal should use, as the channel of prediction
Quality information.
Preferably, described prediction is drawn by measuring the first detectable signal and the second detectable signal.
Present invention also provides a kind of terminal, including：Signal receiving module and feedback module, wherein：
Described signal receiving module, detects letter for receiving the first detectable signal and second at least one detection interval
Number；
Described feedback module, for channel condition information is obtained based on described first detectable signal and the second detectable signal,
And to transmitting terminal feeding back channel state information；Wherein, described channel condition information includes one or more of following information：Ripple
Beam width information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
As seen from the above technical solution, the technical scheme that the application provides is sent out at least one detection interval by transmitting terminal
Send the first detectable signal and the second detectable signal so that receiving terminal can be by the first detectable signal and the second detectable signal
Detection draws the channel status such as the channel quality information of beam angle information, the channel direction information of adaptive quantizing and prediction
Information, and after these information feedbacks are to transmitting terminal, transmitting terminal can adjust sending direction, the ripple of beam shaping accordingly
The beam angle of beam shaping and modulation coding mode, so that the signaling consumption for feedback is reduced, and avoid base
Stand and obtain invalid channel condition information.
Brief description
The acquisition methods that Fig. 1 can be preferably based on the channel condition information of detectable signal for the application one show in the flow process of transmitting terminal
It is intended to；
The feedback method that Fig. 2 can be preferably based on the channel condition information of detectable signal for the application one shows in the flow process of receiving terminal
It is intended to；
Fig. 3 is the first and second detectable signals response schematic diagram in different directions in the embodiment of the present application；
Fig. 4 is a schematic diagram detecting channel deflection error based on difference method in the embodiment of the present application；
Fig. 5 is a beam angle indication feedback and wave beam adjustment schematic diagram in the embodiment of the present application；
Fig. 6 is the schematic flow sheet of predictably terminal imagination CQI in the embodiment of the present application；
Fig. 7 is the computational methods schematic diagram of predictably terminal imagination CQI in the embodiment of the present application；
Fig. 8 is the composition structural representation of the application one preferred base station；
Fig. 9 is the composition structural representation of the preferable terminal of the application one.
Specific embodiment
Purpose, technical scheme and advantage for making the application become more apparent, and develop simultaneously embodiment referring to the drawings, right
The application is described in further detail.
The present invention proposes a kind of acquisition methods of channel condition information, can improve the feedback effect of channel condition information
Rate, reduces feedback overhead and improves the efficiency of the beam-forming transmission based on feedback.The present invention can apply under legacy band
Large scale array antenna system under it is also possible to apply in the large scale array antenna system based on millimeter wave.
Fig. 1 can be preferably based on the flow process in transmitting terminal for the acquisition methods of the channel condition information of detectable signal for the application one
Figure, this flow chart is illustrated that the primary operational of base station side, including：
Step 1：Transmitting terminal sends the first detectable signal and the second detectable signal at least one detection interval.
Step 2：The channel condition information of transmitting terminal receiving terminal feedback, is based on during described channel condition information to described the
The measurement of one detectable signal and the second detectable signal obtains, and described channel condition information includes one of following information or many
Kind：Channel direction information, the beam angle information of adaptive quantizing and the channel quality information of prediction.
Step 3：Transmitting terminal is based on described channel condition information, is sent using corresponding beam shaping and modulation coding mode
Data.Specifically：
Described beam angle information can be obtained with beam shaping width group for transmitting terminal by using different antennae weight
One or more of close, transmitting terminal adjusts antenna weight and makes the width sending wave beam be equal to described beam angle information instruction
Beam angle；
The channel direction information of described adaptive quantizing includes quantified precision and based on the channel side under this quantified precision
To information, transmitting terminal, according to the quantified precision in the channel direction information of described adaptive quantizing, extracts channel direction information, and
The channel direction that beam shaping center position be aligned is extracted；
The channel quality information of described prediction adjusts, for transmitting terminal, the modulating-coding side that should use after beamforming patterns
Formula, transmitting terminal sends data according to described modulation coding mode.
After adjustment, transmitting terminal uses the modulation coding mode of corresponding beam angle, beam shaping center position and instruction
Send data.
Fig. 2 can be preferably based on the flow process in receiving terminal for the acquisition methods of the channel condition information of detectable signal for the application one
Figure, this flow chart is illustrated that the primary operational of end side, including：
Step 1：Receiving terminal receives the first detectable signal and the second detectable signal at least one detection interval.
Step 2：Channel direction information is estimated according to the first detectable signal and the second detectable signal, continues to monitor channel direction
Information estimates that terminal moves angular velocity.
Step 3：Select optimum beam angle, the quantified precision of channel direction information and optimal modulation coded system.
Step 4：To transmitting terminal feeding back channel state information, wherein, described channel condition information is included in following information
One or more：Beam angle information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
Specific embodiment one
Describe the launching beam manufacturing process of CDI detectable signal with reference to Fig. 3 and Fig. 4 in detail.
The beam-forming method that base station sends that the first detectable signal and the second detectable signal used is：In different antennas
On using different precoding modes so that the beam forming coefficients of the first detectable signal and the beam shaping of the second detectable signal
There is differential relationship, the wave beam of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal between coefficient
The first half of form factor is identical, and the latter half of the beam forming coefficients of the second detectable signal is the ripple of the first detectable signal
The opposite number of the latter half of beam shaping coefficient.It should be noted that：First detectable signal is permissible with the second detectable signal itself
It is identical signal on different running time-frequency resources, both differences are that beam forming coefficients are different.Specifically：
The beam forming coefficients (alternatively referred to as beam-forming weights coefficient) that first detectable signal is used are：
First detectable signal (can also be referred to as detectable signal, correspondingly, the second detectable signal be claimed by the second detectable signal
By auxiliary detection signal) beam forming coefficients that used are：
Wherein, θprobFor the dispatching centre angle of the first detectable signal and the second detectable signal, we term it search angle
Degree, N is the antenna number of transmitting terminal, and d is the distance between antenna, and λ is wavelength.I.e.：The beam forming coefficients w1 of the first detectable signal
Vectorial for N-dimensional, its nth elements is expressed asWherein 1≤n≤N；Second detectable signal
Beam forming coefficients w2 be N-dimensional vector, the front N/2 of the beam forming coefficients of its front N/2 element and the first detectable signal is individual
Element is identical, and rear N/2 element is the opposite number of the rear N/2 element of the beam forming coefficients of the first detectable signal (to corresponding
The symbol of element negates).
The real channel direction of hypothesis terminal is θtrue, then there is deviation in detection angle and the real channel direction of terminal
Φ.As shown in figure 3, two detectable signals will obtain different gain of received signal in different deviation Φ.Thus, two groups of spies
Survey the channel directional response that signal constitutes one group of difference, and then allow receiving terminal to carry out difference meter using this different information
Calculate, draw specific channel direction information θtrue.
Receiving terminal carries out Differential Detection by calculating the gain ratio of two groups of detectable signals.As shown in figure 4, channel is true
When direction is less than 0.2 with the deviation detecting angle, there is one-to-one relation in both ratios and actual deviation：When
When deviation is positive number, auxiliary detection signal is real number with the ratio of the reception gain of detectable signal；When deviation is for negative, auxiliary is visited
The ratio surveying signal with the reception gain of detectable signal is imaginary number；And the increase with absolute value of the bias, the ratio also list of reception gain
Adjust and increase.Therefore, for the different terminals in the range of relative detection angle (- 0.2,0.2), terminal always can be led to
Cross the gain ratio estimation of two groups of detectable signals of measurement and the deviation detecting angle.
In contrast, traditional method is only capable of reception gain on multiple beam directions for the comparison terminal, and then selects to increase
Beneficial highest beam direction.That is, traditional method can not obtain the resolution exceeding detectable signal beam angle.And on
State the method based on difference and always can obtain accurate channel direction information in detection interval.The method that this means difference
It is obtained in that the certainty of measurement of significantly larger than traditional method.
Because the method for difference can provide high-precision channel direction information measurement in search coverage, this makes to receive
End obtains a kind of new possibility：By test constantly channel direction information thus estimating the angular velocity of terminal.As terminal can
So that by the speed in Doppler frequency shift estimation base station vertical direction relatively, terminal can be by measuring the change of channel orientation angle
Rate obtains the angular velocity of base station relatively.A kind of simplest method is within the unit interval, the change of measurement channel orientation angle
Change amount.For example, the channel direction information that terminal obtains according to detectable signal twiceWithCalculate terminal angular velocity：Because the angular velocity of terminal determines the sensitivity of terminal-pair directional information accuracy：Angular velocity is higher, eventually
The probability that beam shaping center position is deviateed at end is higher.Simultaneously it is known that wider beam shaping, terminal deviates beam shaping
The change of the receiving power that center position causes is less.Therefore, the application introduces a new channel condition information index：Wave beam
Width indicates (Beam width indication, abbreviation BWI), in order to indicate beam angle information.The idiographic flow of the method
For：Predefine multiple beam angles in systems, receiving terminal passes through to estimate the angular velocity of itself, selects optimum beam angle.
The selection criterion of beam angle is：The bigger terminal of angular velocity chooses the reliability to ensure link for the wider wave beam；Angular velocity
Lower terminal chooses narrower wave beam to improve received signal power.Fig. 5 is an above-mentioned beam angle feedback and wave beam
Width adjustment schematic diagram.Meanwhile, the accuracy of channel orientation measurement can also be as a reference standard, when channel direction estimation
When there is larger error, should be from wider wave beam to ensure link reliability.
Specific embodiment two
Based on above method, receiving terminal can measure accurate channel direction information.However, by quantify after channel direction
Feedback of the information is gone back to base station and be must tie up certain overhead.Therefore, the quantization of channel direction information needs to consider expense and effect
Balance between rate：Higher quantified precision means that base station using more accurately beam shaping, but but can must tie up
Higher upstream control signaling；Conversely, low quantified precision can effectively reduce feedback overhead, but but can reduce the wave beam of base station
Forming efficiency.Therefore, a kind of adaptive quantified precision is selected to balance relation between the two so that systematic entirety energy
Get a promotion.System predefines a series of quantified precision, from coarse to fine.Receiving terminal selects according to the channel status measuring
Excellent quantified precision.For example, if the SNR of terminal is relatively low, or the translational speed of terminal is larger, then very high quantified precision is not
The efficiency of beam shaping can effectively be lifted.This is the high shifting simultaneously because low SNR inherently can reduce the estimation of channel direction information
Dynamic speed has increased the ageing of channel information, even if the channel direction information of feedback is very accurate, the beam shaping of base station
Will deviate from optimal direction.Therefore, terminal can choose optimum quantified precision according to the SNR measuring and translational speed.One
Individual feasible method is less than, for quantization error, the error that estimation difference and feedback delay bring.Meanwhile, terminal is in feedback information
Selected quantified precision should be indicated.Because the angle of space exploration is fixing, adaptive quantified precision selects can also
Effectively reduce unnecessary feedback overhead.Table 1 is that the multi-stage quantization precision that space exploration is 0.4 π is illustrated.
Table 1
| Quantification gradation | a | b | c |
| Quantizing bit number | 2 | 3 | 4 |
| Quantization error | 0.1π | 0.05π | 0.025π |
| Coupling SNR | 5dB | 10dB | 20dB |
Specific embodiment three
Channel quality information (Channel quality index, abbreviation CQI) is also one of channel condition information weight
Want index, CQI indicates the optimal modulation coded system that base station can use.In above-mentioned extensive antenna system, wave beam becomes
Shape technology can effectively lift the SNR of receipt signal.Base station can carry out beam shaping tune according to the channel condition information of feedback
Whole：Adjustment including direction and the adjustment of beam angle.The CQI influencing whether terminal is measured by these adjustment.For example, work as wave beam
When shaping more can be accurately aligned with terminal, terminal is due to obtaining higher SNR such that it is able to the modulation using higher order
Mode or the coding using higher code check.Due to a kind of high-precision channel direction information acquisition methods used herein,
Terminal is allow accurately to know that channel direction and current beam shape the deviation of angle.Which provides a kind of new can
Energy：The SNR value that terminal can be obtained after being adjusted according to this deflection forecast wave beam, that is, optimum modulation after wave beam adjustment
Coded system.This CQI feedback predicted can be gone back to base station by feedback by terminal, and need not measure again after wave beam adjustment
CQI.Note, the CQI after this prediction wave beam adjustment is only only possible to reality in the case of knowable to high accuracy channel direction information
Existing.Therefore traditional channel direction information acquisition methods cannot support this new feedback system.
Fig. 6 is the method flow diagram of the CQI of a feedback forecasting in the embodiment of the present application.First, terminal receives the first spy
Survey signal and the second detectable signal, and then estimate channel direction information and receipt signal SNR.Then, terminal passes through base station side
Beam-forming method calculate beam shaping adjustment after received signal power change.Based on this result of calculation, terminal can be pre-
Survey the SNR value after wave beam adjustment, thus obtaining the CQI parameter of optimum.Finally, the CQI parameter of prediction is fed back to base station by terminal.
Fig. 7 is the specific example of a predictably terminal imagination CQI in the embodiment of the present application.Terminal detects letter by detectable signal
Road direction shapes angle with current beam and differs 0.4 π, and present channel gain is 5.Based on this deviation, terminal can obtain
After beam shaping angle adjustment, channel gain should be 10.Therefore, the SNR gain after wave beam adjustment is 2 times.Terminal information meter successively
Calculate optimum CQI and fed back.
Corresponding to said method, present invention also provides a kind of base station, its composition structure is as shown in figure 8, this base station includes：
Signal transmitting module and feedback reception module, wherein：
Signal transmitting module, for sending the first detectable signal and the second detectable signal at least one detection interval；
Feedback reception module, for receiving based on the survey to described first detectable signal and the second detectable signal from receiving terminal
The channel condition information measuring；Wherein, described channel condition information includes one or more of following information：Channel width
Information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
It is preferred that the beam forming coefficients of described first detectable signal and second that described signal transmitting module sends detect
There is differential relationship, the first half of the beam forming coefficients of the second detectable signal and first between the beam forming coefficients of signal
The first half of the beam forming coefficients of detectable signal is identical, and the latter half of the beam forming coefficients of the second detectable signal is the
The opposite number of the latter half of the beam forming coefficients of one detectable signal.
Preferably, the beam forming coefficients of described first detectable signal are：
The beam forming coefficients of the second detectable signal are：
Wherein, θprobFor the dispatching centre angle of the first detectable signal and the second detectable signal, N is the antenna of transmitting terminal
Number, d is the distance between antenna, and λ is wavelength.I.e. the beam forming coefficients of the first detectable signal are N-dimensional vector, its nth elements
It is expressed asWherein 1≤n≤N；The beam forming coefficients of the second detectable signal be N-dimensional to
Amount, its front N/2 element is identical with the front N/2 element of the beam forming coefficients of the first detectable signal, and rear N/2 element is the
The opposite number (respective element symbol is negated) of the rear N/2 element of the beam forming coefficients of one detectable signal.
Preferably, the described beam angle information that described feedback reception module receives is transmitting terminal by using different antennae
Weight can be obtained with one or more of beam shaping width combination；
Described signal transmitting module, is additionally operable to adjustment antenna weight and makes the width sending wave beam be equal to described beam angle
The beam angle of information instruction.
Preferably, the channel direction information of the described adaptive quantizing of described feedback reception module reception includes quantified precision
And based on the channel direction information under this quantified precision；
Preferably, the channel quality information of the described prediction of described feedback reception module reception is transmitting terminal adjustment wave beam becoming
The modulation coding mode that should use after shape mode；
Described signal transmitting module, is additionally operable to send data according to described modulation coding mode.
Corresponding to said method, present invention also provides a kind of terminal, its composition structure is as shown in figure 9, include：Signal connects
Receive module and feedback module, wherein：
Described signal receiving module, detects letter for receiving the first detectable signal and second at least one detection interval
Number；
Described feedback module, for channel condition information is obtained based on described first detectable signal and the second detectable signal,
And to transmitting terminal feeding back channel state information；Wherein, described channel condition information includes one or more of following information：Letter
Road width information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
Preferably, between the beam forming coefficients of described first detectable signal and the beam forming coefficients of the second detectable signal
There are differential relationship, the beam forming coefficients of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal
First half identical, the latter half of the beam forming coefficients of the second detectable signal is the beam shaping system of the first detectable signal
The opposite number of the latter half of number.
Preferably, described feedback module is used for obtaining receiving terminal by measuring the first detectable signal and the second detectable signal
Mobile angular velocity, and according to channel quality and beam angle information described in mobile angular speed calculation.
Preferably, the SNR that described feedback module is used for according to reference signal chooses different quantified precisions with mobile angular velocity,
And quantify to obtain described channel direction information according to the quantified precision chosen.
Preferably, described feedback module is used for predicting channel direction information and/or the ripple that transmitting terminal is fed back based on receiving terminal
After beam width information is to the adjustment of beam forming coefficients, the modulation coding mode that transmitting terminal should use, as prediction
Channel quality information.
Preferably, described feedback module carries out described prediction by measuring the first detectable signal and the second detectable signal.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all essences in the application
Within god and principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of the application protection.
Claims (17)
1. a kind of channel state information acquisition method is it is characterised in that include：
Transmitting terminal sends the first detectable signal and the second detectable signal at least one detection interval；
Receive based on the channel condition information that the measurement of described first detectable signal and the second detectable signal is obtained from receiving terminal；
Wherein, described channel condition information includes one or more of following information：Beam angle information, the channel of adaptive quantizing
Directional information, the channel quality information of prediction.
2. method according to claim 1 it is characterised in that：
There is difference between the beam forming coefficients of described first detectable signal and the beam forming coefficients of the second detectable signal to close
System, the first half of the beam forming coefficients of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal
Identical, the latter half of the beam forming coefficients of the second detectable signal is the latter half of of the beam forming coefficients of the first detectable signal
The opposite number dividing.
3. method according to claim 2 it is characterised in that：
The beam forming coefficients of described first detectable signal are：
The beam forming coefficients of the second detectable signal are：
Wherein, θprobFor the dispatching centre angle of the first detectable signal and the second detectable signal, N is the antenna number of transmitting terminal, and d is
Distance between antenna, λ is wavelength；
The beam forming coefficients w1 of the first detectable signal is N-dimensional vector, and the nth elements of described N-dimensional vector are
Wherein 1≤n≤N；
The beam forming coefficients w2 of the second detectable signal is N-dimensional vector, and the front N/2 element and first of described N-dimensional vector detects
The front N/2 element of the beam forming coefficients of signal is identical, and rear N/2 element is the beam forming coefficients of the first detectable signal
The opposite number of the N/2 symbol of element afterwards.
4. the method according to any one of claims 1 to 3 it is characterised in that：
Described beam angle information is that transmitting terminal can be obtained with the combination of beam shaping width by using different antennae weight
One or more.
5. method according to claim 4 it is characterised in that：
The method also includes：Transmitting terminal adjusts antenna weight and makes the width sending wave beam be equal to described beam angle information instruction
Beam angle.
6. the method according to any one of claims 1 to 3 it is characterised in that：
The channel direction information of described adaptive quantizing includes quantified precision and based on the channel direction letter under this quantified precision
Breath.
7. method according to claim 6 it is characterised in that：
The method also includes：Transmitting terminal, according to the quantified precision in the channel direction information of described adaptive quantizing, extracts channel
Directional information, and the channel direction that beam shaping center position be aligned is extracted.
8. the method according to any one of claims 1 to 3 it is characterised in that：
The channel quality information of described prediction adjusts, for transmitting terminal, the modulation coding mode that should use after beamforming patterns.
9. method according to claim 8 it is characterised in that：
The method also includes：Transmitting terminal sends data according to described modulation coding mode.
10. a kind of base station is it is characterised in that include：Signal transmitting module and feedback reception module, wherein：
Signal transmitting module, for sending the first detectable signal and the second detectable signal at least one detection interval；
Feedback reception module, for receiving based on measuring to described first detectable signal and the second detectable signal from receiving terminal
The channel condition information arriving；Wherein, described channel condition information includes one or more of following information：Beam angle is believed
Breath, the channel direction information of adaptive quantizing, the channel quality information of prediction.
A kind of 11. channel state information feedback methods are it is characterised in that include：
Receiving terminal receives the first detectable signal and the second detectable signal at least one detection interval；
Channel condition information is obtained based on described first detectable signal and the second detectable signal, and to transmitting terminal fed-back channel status
Information；Wherein, described channel condition information includes one or more of following information：Beam angle information, adaptive quantizing
Channel direction information, prediction channel quality information.
12. methods according to claim 8 it is characterised in that：
There is difference between the beam forming coefficients of described first detectable signal and the beam forming coefficients of the second detectable signal to close
System, the first half of the beam forming coefficients of the first half of the beam forming coefficients of the second detectable signal and the first detectable signal
Identical, the latter half of the beam forming coefficients of the second detectable signal is the latter half of of the beam forming coefficients of the first detectable signal
The opposite number dividing.
13. methods according to claim 8 or claim 9 it is characterised in that：
The method also includes：Receiving terminal obtains the traveling angle speed of receiving terminal by measuring the first detectable signal and the second detectable signal
Degree, and according to channel quality and beam angle information described in mobile angular speed calculation.
14. methods according to claim 8 or claim 9 it is characterised in that：
The method also includes：Receiving terminal chooses different quantified precisions according to the SNR of reference signal with mobile angular velocity, and according to choosing
The quantified precision taking quantifies to obtain described channel direction information.
15. methods according to claim 8 or claim 9 it is characterised in that：
The method also includes：Channel direction information that prediction transmitting terminal is fed back based on receiving terminal and/or beam angle information are to ripple
After the adjustment of beam shaping coefficient, the modulation coding mode that transmitting terminal should use, as the channel quality information of prediction.
16. methods according to claim 15 it is characterised in that：
Described prediction is drawn by measuring the first detectable signal and the second detectable signal.
A kind of 17. terminals are it is characterised in that include：Signal receiving module and feedback module, wherein：
Described signal receiving module, for receiving the first detectable signal and the second detectable signal at least one detection interval；
Described feedback module, for channel condition information is obtained based on described first detectable signal and the second detectable signal, and to
Transmitting terminal feeding back channel state information；Wherein, described channel condition information includes one or more of following information：Wave beam width
Degree information, the channel direction information of adaptive quantizing, the channel quality information of prediction.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/KR2016/008414 WO2017023054A1 (en) | 2015-07-31 | 2016-07-29 | Methods for acquiring and feeding back channel state information, base station and terminal |
| US15/224,610 US10425855B2 (en) | 2015-07-31 | 2016-07-31 | Methods for acquiring and feeding back channel state information, base station and terminal |
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| CN201510463243 | 2015-07-31 | ||
| CN2015104632433 | 2015-07-31 |
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