CN102468947A - Feedback method and equipment for signal channel quality information - Google Patents

Feedback method and equipment for signal channel quality information Download PDF

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Publication number
CN102468947A
CN102468947A CN2010105376446A CN201010537644A CN102468947A CN 102468947 A CN102468947 A CN 102468947A CN 2010105376446 A CN2010105376446 A CN 2010105376446A CN 201010537644 A CN201010537644 A CN 201010537644A CN 102468947 A CN102468947 A CN 102468947A
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terminal equipment
base station
information
determination module
cqi information
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高秋彬
苏昕
沈祖康
肖国军
拉盖施
孙韶辉
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The embodiment of the invention discloses a feedback method and equipment for signal channel quality information. Through the adoption of the technical scheme provided by the embodiment of the invention, terminal equipment calculates channel quality indicator (CQI) information under the condition of hypothetical closed loop pre-coding, factors such as receiving processing algorithms at the terminal equipment side and the like can be more accurately reflected, a base station can be combined with the corresponding CQI information and the signal channel reciprocity processing through the feedback of the CQI information, and more accurate signal channel information can be obtained for carrying out more accurate resource dispatching, so the system performance is improved.

Description

The feedback method of channel quality information and equipment
Technical field
The present invention relates to communication technical field, particularly a kind of feedback method of channel quality information and equipment.
Background technology
Each sub-district has a base station and terminal communication usually in the wireless cellular network system.The type at terminal comprises mobile phone, notebook and PDA etc.Before data transmission procedure began, reference signal (pilot signal) can be sent to the terminal in the base station, and the terminal then obtains channel estimation value according to these reference signals.Reference signal is to appoint at special time the known signal sequence that sends on the CF.Factors such as interference and noise all can influence the quality of channel estimating.
Usually the terminal is positioned at different geographical, has different received signal strength signal intensity and noise and interference intensity.Therefore, some terminals can be with higher rate communication, as is positioned at the terminal of center of housing estate, and the other terminal then can only be with than low rate communication, like the terminal of cell edge.In order to make full use of the transmission bandwidth at terminal, the data format that sends to the terminal preferably can be complementary with the channel condition at this terminal.Make and to send to the data format at terminal and technology that its channel condition is complementary is called link circuit self-adapting.
In OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) system, a plurality of symbols can send on different subcarriers simultaneously.The frequency interval of subcarrier can guarantee the orthogonality between them just.The OFDM modulator converts the data symbol stream of input into through string and conversion the data symbol stream of multidiameter delay.The output of string and conversion can be regarded as the frequency domain data symbol.The subcarrier of bandwidth both sides is not used in transfer of data, is called the protection bandwidth.Data symbol on some subcarriers in the data bandwidth scope can be set as the known symbol of receiving terminal, and the symbol on these subcarriers just is called frequency pilot sign.Receiving terminal can utilize these frequency pilot signs to estimate channel, realizes coherent demodulation.It is time-domain signal with the frequency domain data symbol transition that transmitter utilizes IFFT (Inverse Fast Fourier Transform, Fast Fourier Transform Inverse) conversion.The structure of IFFT can guarantee that each subcarrier is a quadrature.Cyclic Prefix is to obtain through copying the some sampled datas in the end of time-domain symbol to the time-domain signal front end, and the effect of Cyclic Prefix is to overcome intersymbol interference.The time domain waveform signal that has comprised Cyclic Prefix is called the OFDM symbol, and this OFDM symbol is sent by radio circuit.The OFDM receiver at first obtains time and Frequency Synchronization, and the data that then sampling obtained obtain frequency domain through the FFT conversion and receive signal after removing Cyclic Prefix.Frequency pilot sign can be used for channel estimating, helps to recover the data on each subcarrier.And the data after the string conversion are sent to decoder for decoding.
The OFDMA technology is based on a kind of multiple access transmission technology of OFDM technology.Frequency resource in the system bandwidth is divided into a certain size Resource Block, and each Resource Block is the least resource unit of resource allocation in the frequency domain.The OFDMA system is dispatched to different terminal on the different resource piece in the system bandwidth scope, realizes the orthogonal transmission between the user.
The descending employing of 3GPP LTE OFDMA technology, the minimum particle size of resource on time domain of each subframe (1ms) is the OFDM symbol, and 12 or 14 OFDM symbols are arranged in each subframe.Minimum particle size on frequency domain is a subcarrier.Minimum time-frequency unit definition is a basic resources unit, i.e. RE (resource element).The minimum resource allocation unit of LTE system definition be Physical Resource Block (Physical Resource Block, PRB).A PRB comprises the corresponding RE of 12 number of sub-carrier continuous on interior all the OFDM symbols of a sub-frame.A terminal possibly be scheduled on the continuous perhaps discontinuous Physical Resource Block.
LTE Rel-8 system has introduced the closed loop precoding technique and has improved spectrum efficiency.The closed loop precoding at first requires the set of all preserving same pre-coding matrix at base station and terminal, is called code book.After the terminal estimates channel information according to cell common pilots, from code book, select a pre-coding matrix by certain criterion.The criterion of choosing can be maximization mutual information, maximization output Signal to Interference plus Noise Ratio etc.The terminal feeds back to the base station with the index of the pre-coding matrix of selecting in code book through up channel, and this index is designated as PMI (Precoding Matrix Indicator, pre-coding matrix index).The pre-coding matrix that should use this terminal just can be confirmed in the base station by the index value of receiving.The pre-coding matrix of terminal to report can be regarded as the quantized value of channel condition information.
In order to help the base station to realize link circuit self-adapting, the terminal need according to its channel condition reporting channel quality indication (CQI) information (Channel Quality Indicator, CQI).The CQI of terminal to report corresponding certain running time-frequency resource, that is to say that the CQI of terminal to report is the transmittability on these running time-frequency resources of expression.Interference I and noise power N that the calculating of CQI needs the terminal to record it to receive 0, the example of simple directly CQI calculating is:
CQI = P I + N 0
Wherein P is the received signal power at terminal.That in fact the terminal records possibly be I+N 0Whole.
For adopting closed loop precoding system for transmitting, the calculating of CQI will be according to the pre-coding matrix of selecting.Suppose that the base station to the channel state matrix at terminal is:
Figure BSA00000340293000032
Wherein, h IjBe the Channel Transmission coefficient of the j root antenna of base station to the i root antenna at terminal.The terminal is selected pre-coding matrix according to certain algorithm from predefined code book, might as well remember that the pre-coding matrix of selecting is V.Equivalent channel from the base station to the terminal is designated as
Figure BSA00000340293000033
then can be calculated as follows Signal to Interference plus Noise Ratio in the terminal:
SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 - - - ( 1 )
The terminal is transferred to the base station with PMI that calculates and CQI through up channel.The base station utilizes the PMI of terminal to report to carry out the preliminary treatment of transmitting terminal, utilizes the CQI of terminal to report to carry out link circuit self-adapting (comprising the selection of modulation system and code rate etc.).Terminal to report PMI and CQI can take a large amount of upstream channel bandwidths, cause the resource utilization of up channel to descend, and can introduce quantization error etc.In the TDD system, the signal of uplink and downlink sends on identical carrier wave, so the reciprocity of up-downgoing channel is set up.So-called reciprocity is meant that up channel is identical with down channel.Utilize the up-downgoing channel reciprocity to estimate up channel, thereby obtain descending channel information, calculate the required pre-coding matrix of downlink transfer, saved a large amount of feedback overheads by the upward signal that send at the terminal.All support to utilize the transmission plan of channel reciprocity in 3GPP LTE R8/R9/R10 and the later version.Yet channel reciprocity is invalid to interference and noise, that is to say that the base station only relies on channel reciprocity can't calculate CQI accurately.Therefore, require terminal to report CQI information to realize downlink transfer among the 3GPP LTE based on channel reciprocity with assistant base station.Because the pre-coding matrix that the base station is used is unknown for the terminal, can not calculate CQI according to (1).It is that the supposition transmission plan is single port (single port) transmission or transmit diversity (multiport) that the LTE prescribed terminal is calculated CQI.The CQI that calculates based on these two kinds of hypothesis is with actual transmission situation and do not match, and the base station also need be made certain compensation and could be used to the CQI of terminal to report.The backoff algorithm of base station can't be made adjustment according to the variation of the conditions such as detection algorithm at terminal, and performance is impaired.The present invention proposes a solution for addressing this problem.
In the process that realizes the embodiment of the invention, the applicant finds that there is following problem at least in prior art:
The CQI of prior art calculates feedback and is based on that single port transmission or transmit diversity transmission carry out, and does not match with the transmission plan of reality.The base station also need be made certain compensation and could be used to the CQI of terminal to report.The backoff algorithm of base station can't be made adjustment according to the variation of the conditions such as detection algorithm at terminal, and performance is limited.
Summary of the invention
The embodiment of the invention provides a kind of feedback method and equipment of channel quality information, the problem that the channel quality information based in the transmission plan of channel reciprocity that exists in the solution prior art reports.
For achieving the above object, the embodiment of the invention provides a kind of feedback method of channel quality information on the one hand, comprising:
The measurement pilot frequency that terminal equipment sends according to the base station that receives is confirmed the channel state matrix of said base station to said terminal equipment;
Said terminal equipment is confirmed at least one pre-coding matrix according to said channel state matrix and preset code book set;
Said terminal equipment is confirmed CQI information according to said pre-coding matrix and said channel state matrix;
Said terminal equipment is given said base station with said CQI information reporting.
On the other hand, the embodiment of the invention also provides a kind of terminal equipment, comprising:
Module is set, is used for preset code book set;
Receiver module is used to receive the measurement pilot frequency that send the base station;
First determination module is used for the measurement pilot frequency according to the received base station transmission of said receiver module, confirms the channel state matrix of said base station to said terminal equipment;
Second determination module is used for gathering according to determined channel state matrix of said first determination module and the said default code book of module that is provided with, and confirms at least one pre-coding matrix;
The 3rd determination module is used for confirming CQI information according to determined pre-coding matrix of said second determination module and the determined channel state matrix of said first determination module;
Sending module is used for giving said base station with the determined CQI information reporting of said the 3rd determination module.
On the other hand, the embodiment of the invention also provides a kind of feedback method of channel quality information, comprising:
CQI information and uplink pilot signal that the base station receiving terminal apparatus reports;
Up channel condition information is confirmed through the uplink pilot signal that said terminal equipment sends in said base station, and confirms descending channel condition information according to channel reciprocity;
The selection of scheduling of resource and transmission means is carried out according to the CQI information that said terminal equipment reports in said base station to said terminal equipment;
Said base station on the corresponding resource of said terminal equipment according to said transmission means to said terminal equipment transmitting downlink data.
On the other hand, the embodiment of the invention also provides a kind of base station, comprising:
Receiver module is used for CQI information and uplink pilot signal that receiving terminal apparatus reports;
Determination module is used for confirming up channel condition information through the uplink pilot signal that the received said terminal equipment of said receiver module sends, and confirms descending channel condition information according to channel reciprocity;
Scheduler module is used for the CQI information that reports according to the received said terminal equipment of said receiver module, said terminal equipment is carried out the selection of scheduling of resource and transmission means;
Sending module is used on the corresponding resource of said terminal equipment that said scheduler module is dispatched according to said transmission means to said terminal equipment transmitting downlink data.
Compared with prior art, the embodiment of the invention has the following advantages:
Through using the technical scheme of the embodiment of the invention, terminal equipment calculates CQI information under the situation of hypothesis closed loop precoding; The factors such as reception Processing Algorithm that can reflect terminal equipment side more accurately; And the feedback through CQI information makes the base station can combine corresponding C QI information and channel reciprocity to handle, and obtains channel information more accurately, so that carry out scheduling of resource more accurately; Thereby, the performance of raising system.
Description of drawings
Fig. 1 is the schematic flow sheet of the feedback method of a kind of channel quality information that the embodiment of the invention proposed in terminal equipment side;
Fig. 2 is the schematic flow sheet of the feedback method of a kind of channel quality information that the embodiment of the invention proposed in base station side;
Fig. 3 is the schematic flow sheet of the feedback method of a kind of concrete application scenarios lower channel quality information of embodiment of the invention proposition;
Fig. 4 is the structural representation of a kind of terminal equipment that the embodiment of the invention proposed;
Fig. 5 is the structural representation of a kind of base station that the embodiment of the invention proposed.
Embodiment
Of background technology; Since in the prior art terminal equipment calculates and to the CQI of base station feedback information be based on the single port transmission perhaps transmit diversity transmit and carry out; So; The base station can only get access to the CQI information that is not complementary with the actual transmissions scheme, thereby, can't obtain newly arriving quality information accurately.
In order to solve such problem; The embodiment of the invention has provided a kind of feedback method of channel quality information; Terminal equipment is through calculating CQI information under the situation of hypothesis closed loop and coding, thereby, can be to base station feedback CQI information more accurately; Thereby, make the base station obtain channel condition information more accurately.
As shown in Figure 1, the schematic flow sheet for the feedback method of a kind of channel quality information that the embodiment of the invention proposed specifically may further comprise the steps:
The measurement pilot frequency that step S101, terminal equipment send according to the base station that receives confirms that the base station arrives the channel state matrix of terminal equipment.
In the application scenarios of reality, the concrete processing procedure of this step is:
The measurement pilot frequency that terminal equipment sends according to the base station that receives, the estimation base station to the channel state matrix H of terminal equipment is:
Figure BSA00000340293000061
Step S102, terminal equipment are confirmed at least one pre-coding matrix according to channel state matrix and preset code book set.
In the application scenarios of reality, the concrete processing procedure of this step is:
Terminal equipment is according to preset code book set C={V 1, V 2..., V N, and estimate the channel state matrix H that obtains, confirm at least one pre-coding matrix V according to following formula:
V = arg max V n ∈ C | | HV n | | 2 .
It is to be noted; Above-mentioned formula is that the embodiment of the invention is explained and an example selecting for ease; In practical application; Can adjust the content of above-mentioned formula as required, every formula or algorithm of gathering definite pre-coding matrix according to channel state matrix and preset code book all should belong to protection scope of the present invention.
Step S103, terminal equipment are confirmed CQI information according to pre-coding matrix and channel state matrix, and the concrete processing procedure of this step comprises:
Terminal equipment is confirmed signal to noise ratio according at least one pre-coding matrix of confirming;
The value of a CQI information confirmed the signal to noise ratio mapping by terminal equipment.
In concrete application scenarios, terminal equipment is confirmed signal to noise ratio SINR according at least one pre-coding matrix of confirming according to following formula:
SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 ;
Wherein,
Figure BSA00000340293000073
H is the channel state matrix of the determined base station of terminal equipment to terminal equipment, and V is the determined pre-coding matrix of terminal equipment
I is the suffered interference of terminal equipment;
N 0Be the suffered noise power of terminal equipment.
It is to be noted; Above-mentioned formula is that the embodiment of the invention is explained and an example selecting for ease; In practical application; Can adjust the content of above-mentioned formula as required, everyly confirm that according to pre-coding matrix and channel state matrix when the formula or the algorithm of CQI information all should belong to protection scope of the present invention to noise.
Need further be pointed out that; In this step; In fact terminal equipment supposes that the current pre-coding matrix of in the step S102 of application of aforementioned, being selected exactly in base station carries out downlink data transmission; In the case,, pre-coding matrix obtains because being information such as measurement pilot frequency according to the actual transmission in base station, so; Terminal equipment can be not again carry out confirming of CQI information based on single port transmission or transmit diversity transmission etc. and the actual transmissions scheme scheme that is not complementary, and has avoided defective of the prior art.
Step S104, terminal equipment are given the base station with the CQI information reporting.
After this step was accomplished, the technical scheme that present embodiment proposed also comprised:
Terminal equipment receives the downlink data that transmit according to the transmission means of confirming according to CQI information the base station on corresponding resource.
In conjunction with concrete application scenarios, this processing process is actual to be distributed on the time-domain resource of terminal equipment for terminal equipment receives the base station, uses the downlink data of confirming according to CQI information that MCS transmitted.
Need further be pointed out that; After in step S101, having confirmed channel state matrix, in concrete application scenarios, terminal equipment can also further be confirmed RI information; And; According to the value of the RI information of confirming, in step S103, the determined CQI information of terminal equipment comprises following two kinds of situation:
If the value of RI information is greater than 1, then terminal equipment is confirmed a plurality of CQI information, if the value of RI information equals 1, then terminal equipment is confirmed 1 CQI information.
Accordingly, in such cases, terminal equipment reports the base station with RI information and CQI information together in step S104.
Because compared with prior art; Terminal equipment is more accurate to the CQI of base station feedback information; So CQI information can be confirmed carrying out channel condition information through channel reciprocity in base station side, and realize information reference in the process of respective resources scheduling; Make the base station confirm final resource scheduling scheme with the information of actual transmissions state, and select more suitable MCS scheme according to more approaching.
Said process is the realization flow of the feedback method of a kind of channel quality information that the embodiment of the invention proposed in terminal equipment side; Accordingly; The embodiment of the invention also provides the realization flow of this technical scheme in base station side, and its schematic flow sheet is as shown in Figure 2, specifically may further comprise the steps:
CQI information and uplink pilot signal that step S201, base station receiving terminal apparatus report.
Step S202, base station are confirmed up channel condition information through the uplink pilot signal that terminal equipment sends, and are confirmed descending channel condition information according to channel reciprocity.
After this step was accomplished, the present technique scheme also comprised following processing procedure:
Pre-coding matrix is confirmed according to descending channel condition information in the base station; Concrete; In the application scenarios of reality, such processing procedure is to confirm pre-coding matrix by the base station through the pairing channel state matrix of descending channel condition information is carried out singular value decomposition.
The selection of scheduling of resource and transmission means is carried out according to the CQI information that terminal equipment reports in step S203, base station to terminal equipment.
Concrete contents processing be the base station according to the CQI information that terminal equipment reports, terminal equipment is carried out the selection of frequency domain selectivity scheduling of resource and MCS.
Step S204, base station on the corresponding resource of terminal equipment according to transmission means to the terminal equipment transmitting downlink data.
The situation of further confirming RI information with terminal equipment among the aforesaid embodiment is corresponding, and among the step S201, the base station can also receive the RI information that terminal equipment reports.
On the one hand, if the value of this RI information equals 1, the quantity of the CQI information that this terminal equipment that the base station receives reports should be 1, and if the value of this RI information greater than 1, the quantity of the CQI information that this terminal equipment that the base station receives reports should be a plurality of.
On the other hand; The base station also can be according to the value of this RI information; Confirm the transmission situation of parallel downlink data; Be the base station according to RI information and definite descending channel condition information, further confirm the number of data streams of descending parallel transmission, and according to the established data flow amount to the terminal equipment transmitting downlink data.
It is pointed out that if the RI information that terminal equipment reports is not received in the base station corresponding RI information can also be confirmed through the relevant informations such as uplink channel information of terminal equipment transmission in the base station, such variation is equally applicable to protection scope of the present invention.
Compared with prior art, the embodiment of the invention has the following advantages:
Through using the technical scheme of the embodiment of the invention, terminal equipment calculates CQI information under the situation of hypothesis closed loop precoding; The factors such as reception Processing Algorithm that can reflect terminal equipment side more accurately; And the feedback through CQI information makes the base station can combine corresponding C QI information and channel reciprocity to handle, and obtains channel information more accurately, so that carry out scheduling of resource more accurately; Thereby, the performance of raising system.
Below, the application scenarios in conjunction with concrete describes the technical scheme that the embodiment of the invention proposed.
As shown in Figure 3, the schematic flow sheet for the feedback method of a kind of channel quality information that the embodiment of the invention proposed specifically may further comprise the steps:
The measurement pilot frequency (CSI-RS) that step S301, terminal equipment send according to the base station estimates the channel state matrix H from the base station to the terminal equipment.
Wherein,
Figure BSA00000340293000101
Step S302, the code book set C={V of terminal equipment from defining in advance 1, V 2..., V NIn select one or more pre-coding matrix V:
Wherein, V = Arg Max V n ∈ C | | HV n | | 2 .
The pre-coding matrix that step S303, terminal equipment hypothesis base station applies are selected carries out the transmission of downlink data to it, calculates Signal to Interference plus Noise Ratio SINR, and the SINR that calculates is mapped to a CQI value.
Wherein, SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 .
Step S304, terminal equipment are transferred to the base station with the CQI value of calculating through up channel, the CQI information that the base station receiving terminal apparatus reports.
The uplink pilot signal that step S305, base station utilize terminal equipment to send obtains up channel condition information, obtains descending channel condition information by channel reciprocity.
Pre-coding matrix is calculated according to downlink channel condition information in the base station, and this pre-coding matrix is not necessarily limited in the code book, can obtain (the right singular vector of channel) through channel state matrix being carried out singular value decomposition.
The CQI information that step S306, base station utilize terminal equipment to report is carried out the scheduling of frequency domain selectivity and MCS selects.
Step S307, base station send data with the MCS and the pre-coding matrix that calculate to terminal equipment distributing on the running time-frequency resource of terminal equipment.
Because compared with prior art; Terminal equipment is more accurate to the CQI of base station feedback information; So CQI information can be confirmed carrying out channel condition information through channel reciprocity in base station side, and realize information reference in the process of respective resources scheduling; Make the base station confirm final resource scheduling scheme with the information of actual transmissions state, and select more suitable MCS scheme according to more approaching.
Compared with prior art, the embodiment of the invention has the following advantages:
Through using the technical scheme of the embodiment of the invention, terminal equipment calculates CQI information under the situation of hypothesis closed loop precoding; The factors such as reception Processing Algorithm that can reflect terminal equipment side more accurately; And the feedback through CQI information makes the base station can combine corresponding C QI information and channel reciprocity to handle, and obtains channel information more accurately, so that carry out scheduling of resource more accurately; Thereby, the performance of raising system.
In order to realize the technical scheme of the embodiment of the invention, the embodiment of the invention has also proposed a kind of terminal equipment, and its structural representation is as shown in Figure 4, specifically comprises:
Module 41 is set, is used for preset code book set;
Receiver module 42 is used to receive the measurement pilot frequency that send the base station;
First determination module 43 is used for the measurement pilot frequency of sending according to the received base stations of receiver module 42, confirms that the base station arrives the channel state matrix of terminal equipment;
Second determination module 44 is used for according to first determination module, 43 determined channel state matrix and module 41 default code books is set gathering, and confirms at least one pre-coding matrix;
The 3rd determination module 45 is used for confirming CQI information according to second determination module, 44 determined pre-coding matrixes;
Sending module 46 is used for giving the base station with the 3rd determination module 45 determined CQI information reporting.
Wherein, second determination module 44 specifically is used for:
According to module 41 default code book set C={V are set 1, V 2..., V N, and the channel state matrix H that obtains of first determination module 43 estimation, confirm at least one pre-coding matrix V according to following formula:
V = arg max V n ∈ C | | HV n | | 2 .
On the other hand, the 3rd determination module 45 specifically is used for:
According to second determination module, 44 determined at least one pre-coding matrix, confirm signal to noise ratio;
The signal to noise ratio mapping is confirmed the value of a CQI information.
It is pointed out that in this process the 3rd determination module 45 is confirmed signal to noise ratio SINR according to following formula:
SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 ;
Wherein,
Figure BSA00000340293000113
H is the channel state matrix of the determined base station of terminal equipment to terminal equipment
V is the determined pre-coding matrix of terminal equipment
I is the suffered interference of terminal equipment;
N 0Be the suffered noise power of terminal equipment.
Further, receiver module 42 also is used for:
Receive the downlink data of base station according to the definite transmitted over resources of the 3rd determination module 45 determined CQI information.
In concrete application scenarios, receiver module 42 specifically is used for:
Receive the base station and distributing on the time-domain resource of terminal equipment, use the downlink data of confirming according to the 3rd determination module 45 determined CQI information that MCS transmitted.
In the concrete application scenarios of another kind, second determination module 44 also is used for confirming RI information according to first determination module, 43 determined channel state matrix.
Accordingly, the 3rd determination module 45 specifically is used for according to first determination module, 43 determined channel state matrix, and second determination module, 44 determined pre-coding matrixes and RI information are confirmed CQI information;
Wherein, if the value of second determination module, 44 determined RI information greater than 1, then the 3rd determination module 45 is confirmed a plurality of CQI information, if the value of second determination module, 44 determined RI information equals 1, then the 3rd determination module 45 is confirmed 1 CQI information.
Further, sending module 46 specifically is used for giving the base station with second determination module, 44 determined RI information and the 3rd determination module 45 determined CQI information reporting.
On the other hand, the embodiment of the invention also provides a kind of base station, and its structural representation is as shown in Figure 5, comprising:
Receiver module 51 is used for CQI information and uplink pilot signal that receiving terminal apparatus reports;
Determination module 52 is used for confirming up channel condition information through the uplink pilot signal that receiver module 51 received terminal equipments send, and confirms descending channel condition information according to channel reciprocity;
Scheduler module 53 is used for the CQI information that reports according to receiver module 51 received terminal equipments, terminal equipment is carried out the selection of scheduling of resource and transmission means;
Sending module 54 is used on the corresponding resource of terminal equipment that scheduler module 53 is dispatched according to transmission means to the terminal equipment transmitting downlink data.
Further, determination module 52 also is used for:
After confirming descending channel condition information, confirm pre-coding matrix according to descending channel condition information.
In the application scenarios of reality, determination module 52 specifically is used for:
The pairing channel state matrix of descending channel condition information is carried out singular value decomposition, confirm pre-coding matrix.
Further, scheduler module 53 specifically is used for:
According to the CQI information that receiver module 51 received terminal equipments report, terminal equipment is carried out the selection of frequency domain selectivity scheduling of resource and MCS.
In concrete application scenarios, receiver module 51 also is used for the RI information that receiving terminal apparatus reports.
When receiver module 51 receives the RI information that terminal equipment reports,
If receiver module 51 receives the value of the RI information that terminal equipment reports greater than 1; Then receiver module 51 receives a plurality of CQI information that terminal equipment reports; Equal 1 if receiver module 51 receives the value of the RI information that terminal equipment reports, then receiver module 51 receives 1 the CQI information that terminal equipment reports.
Further, determination module 52, the number of data streams that RI information that also is used for being received according to receiver module 51 and descending channel condition information are confirmed descending parallel transmission;
Sending module 54 also is used for according to determination module 52 determined number of data streams to the terminal equipment transmitting downlink data.
It is pointed out that if the RI information that terminal equipment reports is not received in the base station corresponding RI information can also be confirmed through the relevant informations such as uplink channel information of terminal equipment transmission in the base station, such variation is equally applicable to protection scope of the present invention.
Compared with prior art, the embodiment of the invention has the following advantages:
Through using the technical scheme of the embodiment of the invention, terminal equipment calculates CQI information under the situation of hypothesis closed loop precoding; The factors such as reception Processing Algorithm that can reflect terminal equipment side more accurately; And the feedback through CQI information makes the base station can combine corresponding C QI information and channel reciprocity to handle, and obtains channel information more accurately, so that carry out scheduling of resource more accurately; Thereby, the performance of raising system.
Through the description of above execution mode, those skilled in the art can be well understood to the embodiment of the invention and can realize through hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding; The technical scheme of the embodiment of the invention can be come out with the embodied of software product, this software product can be stored in a non-volatile memory medium (can be CD-ROM, USB flash disk; Portable hard drive etc.) in; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) each implements the described method of scene to carry out the embodiment of the invention.
It will be appreciated by those skilled in the art that accompanying drawing is a preferred sketch map of implementing scene, module in the accompanying drawing or flow process might not be that embodiment of the present invention embodiment is necessary.
It will be appreciated by those skilled in the art that the module in the device of implementing in the scene can be distributed in the device of implementing scene according to implementing scene description, also can carry out respective change and be arranged in the one or more devices that are different from this enforcement scene.The module of above-mentioned enforcement scene can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of implementing scene just to description.
More than the disclosed several practical implementation scenes that are merely the embodiment of the invention, still, the embodiment of the invention is not limited thereto, any those skilled in the art can think variation all should fall into the traffic limits scope of the embodiment of the invention.

Claims (32)

1. the feedback method of a channel quality information is characterized in that, comprising:
The measurement pilot frequency that terminal equipment sends according to the base station that receives is confirmed the channel state matrix of said base station to said terminal equipment;
Said terminal equipment is confirmed at least one pre-coding matrix according to said channel state matrix and preset code book set;
Said terminal equipment is confirmed CQI information according to said pre-coding matrix and said channel state matrix;
Said terminal equipment is given said base station with said CQI information reporting.
2. the method for claim 1 is characterized in that, said terminal equipment is confirmed at least one pre-coding matrix according to said channel state matrix and preset code book set, specifically comprises:
Said terminal equipment is according to preset code book set C={V 1, V 2..., V N, and estimate the channel state matrix H that obtains, confirm at least one pre-coding matrix V according to following formula:
V = arg max V n ∈ C | | HV n | | 2 .
3. the method for claim 1 is characterized in that, said terminal equipment is confirmed CQI information according to said pre-coding matrix and said channel state matrix, specifically comprises:
Said terminal equipment is confirmed signal to noise ratio according to said at least one definite pre-coding matrix and said channel state matrix;
The value of a CQI information confirmed said signal to noise ratio mapping by said terminal equipment.
4. method as claimed in claim 3 is characterized in that, said terminal equipment is confirmed signal to noise ratio SINR according to said at least one definite pre-coding matrix and said channel state matrix according to following formula:
SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 ;
Wherein,
Figure FSA00000340292900013
H is the channel state matrix of the determined said base station of said terminal equipment to said terminal equipment, and V is the determined pre-coding matrix of said terminal equipment
I is the suffered interference of said terminal equipment;
N 0Be the suffered noise power of said terminal equipment.
5. the method for claim 1 is characterized in that, said terminal equipment is given said CQI information reporting after the said base station, also comprises:
Said terminal equipment receives the downlink data that transmit according to the transmission means of confirming according to said CQI information said base station on corresponding resource.
6. method as claimed in claim 5 is characterized in that, said terminal equipment receives the downlink data that transmit according to the transmission means of confirming according to said CQI information said base station on corresponding resource, specifically comprise:
Said terminal equipment receives said base station and is distributing on the time-domain resource of said terminal equipment, uses the downlink data of confirming according to said CQI information that MCS transmitted.
7. the method for claim 1 is characterized in that, the measurement pilot frequency that said terminal equipment sends according to the base station that receives confirms that said base station after the channel state matrix of said terminal equipment, also comprises:
Said terminal equipment is confirmed RI information according to said channel state matrix.
8. method as claimed in claim 7 is characterized in that, said terminal equipment is confirmed CQI information according to said pre-coding matrix and said channel state matrix, is specially:
Said terminal equipment is confirmed CQI information according to said pre-coding matrix, said channel state matrix and said RI information;
Wherein, if the value of said RI information greater than 1, then said terminal equipment is confirmed a plurality of CQI information, if the value of said RI information equals 1, then said terminal equipment is confirmed 1 CQI information.
9. method as claimed in claim 8 is characterized in that, said terminal equipment is given said base station with said CQI information reporting, specifically comprises:
Said terminal equipment is given said base station with said RI information and said CQI information reporting.
10. a terminal equipment is characterized in that, comprising:
Module is set, is used for preset code book set;
Receiver module is used to receive the measurement pilot frequency that send the base station;
First determination module is used for the measurement pilot frequency according to the received base station transmission of said receiver module, confirms the channel state matrix of said base station to said terminal equipment;
Second determination module is used for gathering according to determined channel state matrix of said first determination module and the said default code book of module that is provided with, and confirms at least one pre-coding matrix;
The 3rd determination module is used for confirming CQI information according to determined pre-coding matrix of said second determination module and the determined channel state matrix of said first determination module;
Sending module is used for giving said base station with the determined CQI information reporting of said the 3rd determination module.
11. terminal equipment as claimed in claim 10 is characterized in that, said second determination module specifically is used for:
According to the said default code book set of the module C={V that is provided with 1, V 2..., V N, and the channel state matrix H that obtains of said first determination module estimation, confirm at least one pre-coding matrix V according to following formula:
V = arg max V n ∈ C | | HV n | | 2 .
12. terminal equipment as claimed in claim 10 is characterized in that, said the 3rd determination module specifically is used for:
According to determined at least one pre-coding matrix of said second determination module and the determined channel state matrix of said first determination module, confirm signal to noise ratio;
Said signal to noise ratio mapping is confirmed the value of a CQI information.
13. terminal equipment as claimed in claim 12 is characterized in that, said the 3rd determination module is confirmed signal to noise ratio SINR according to following formula:
SINR = | | H ~ | | 2 I + N 0 = | | HV | | 2 I + N 0 ;
Wherein,
Figure FSA00000340292900033
H is the channel state matrix of the determined said base station of said terminal equipment to said terminal equipment, and V is the determined pre-coding matrix of said terminal equipment
I is the suffered interference of said terminal equipment;
N 0Be the suffered noise power of said terminal equipment.
14. terminal equipment as claimed in claim 10 is characterized in that, said receiver module also is used for:
Receive the downlink data of said base station according to the definite transmitted over resources of the determined CQI information of said the 3rd determination module.
15. terminal equipment as claimed in claim 14 is characterized in that, said receiver module specifically is used for:
Receive said base station and distributing on the time-domain resource of said terminal equipment, use the downlink data of confirming according to the determined CQI information of said the 3rd determination module that MCS transmitted.
16. terminal equipment as claimed in claim 10 is characterized in that, said second determination module also is used for:
Confirm RI information according to the determined channel state matrix of said first determination module.
17. terminal equipment as claimed in claim 16 is characterized in that, said the 3rd determination module specifically is used for:
According to the determined channel state matrix of said first determination module, and the determined pre-coding matrix of said second determination module and RI information are confirmed CQI information;
Wherein, If the value of the determined RI information of said second determination module is greater than 1; Then said the 3rd determination module is confirmed a plurality of CQI information, if the value of the determined RI information of said second determination module equals 1, then said the 3rd determination module is confirmed 1 CQI information.
18. terminal equipment as claimed in claim 17 is characterized in that, said sending module specifically is used for:
Give said base station with determined RI information of said second determination module and the determined CQI information reporting of said the 3rd determination module.
19. the feedback method of a channel quality information is characterized in that, comprising:
CQI information and uplink pilot signal that the base station receiving terminal apparatus reports;
Up channel condition information is confirmed through the uplink pilot signal that said terminal equipment sends in said base station, and confirms descending channel condition information according to channel reciprocity;
The selection of scheduling of resource and transmission means is carried out according to the CQI information that said terminal equipment reports in said base station to said terminal equipment;
Said base station on the corresponding resource of said terminal equipment according to said transmission means to said terminal equipment transmitting downlink data.
20. method as claimed in claim 19 is characterized in that, up channel condition information is confirmed through the uplink pilot signal that said terminal equipment sends in said base station, and confirms also to comprise after the descending channel condition information according to channel reciprocity:
Pre-coding matrix is confirmed according to said descending channel condition information in said base station.
21. method as claimed in claim 20 is characterized in that, pre-coding matrix is confirmed according to said descending channel condition information in said base station, is specially:
Singular value decomposition is carried out to the pairing channel state matrix of said descending channel condition information in said base station, confirms pre-coding matrix.
22. method as claimed in claim 19 is characterized in that, said base station is carried out the selection of scheduling of resource and transmission means according to the CQI information that said terminal equipment reports to said terminal equipment, is specially:
The selection of frequency domain selectivity scheduling of resource and MCS is carried out according to the CQI information that said terminal equipment reports in said base station to said terminal equipment.
23. method as claimed in claim 19 is characterized in that, in the CQI information that said base station receiving terminal apparatus reports and the process of uplink pilot signal, also comprises:
Said base station receives the RI information that said terminal equipment reports.
24. method as claimed in claim 23 is characterized in that, when said base station receives the RI information that said terminal equipment reports, also comprises:
If said base station receives the value of the RI information that said terminal equipment reports greater than 1; Then said base station receives a plurality of CQI information that said terminal equipment reports; Equal 1 if said base station receives the value of the RI information that said terminal equipment reports, then said base station receives 1 the CQI information that said terminal equipment reports.
25. method as claimed in claim 24 is characterized in that, said base station on the corresponding resource of said terminal equipment according to said transmission means to said terminal equipment transmitting downlink data, specifically comprise:
The number of data streams of descending parallel transmission is confirmed according to said RI information and said descending channel condition information in said base station, and according to the said number of data streams of confirming to said terminal equipment transmitting downlink data.
26. a base station is characterized in that, comprising:
Receiver module is used for CQI information and uplink pilot signal that receiving terminal apparatus reports;
Determination module is used for confirming up channel condition information through the uplink pilot signal that the received said terminal equipment of said receiver module sends, and confirms descending channel condition information according to channel reciprocity;
Scheduler module is used for the CQI information that reports according to the received said terminal equipment of said receiver module, said terminal equipment is carried out the selection of scheduling of resource and transmission means;
Sending module is used on the corresponding resource of said terminal equipment that said scheduler module is dispatched according to said transmission means to said terminal equipment transmitting downlink data.
27. base station as claimed in claim 26 is characterized in that, said determination module also is used for:
After confirming descending channel condition information, confirm pre-coding matrix according to said descending channel condition information.
28. base station as claimed in claim 27 is characterized in that, said determination module specifically is used for:
The pairing channel state matrix of said descending channel condition information is carried out singular value decomposition, confirm pre-coding matrix.
29. base station as claimed in claim 27 is characterized in that, said scheduler module specifically is used for:
According to the CQI information that the received said terminal equipment of said receiver module reports, said terminal equipment is carried out the selection of frequency domain selectivity scheduling of resource and MCS.
30. base station as claimed in claim 26 is characterized in that, said receiver module also is used for:
Receive the RI information that said terminal equipment reports.
31. base station as claimed in claim 30 is characterized in that, when said receiver module receives the RI information that said terminal equipment reports,
If said receiver module receives the value of the RI information that said terminal equipment reports greater than 1; Then said receiver module receives a plurality of CQI information that said terminal equipment reports; Equal 1 if said receiver module receives the value of the RI information that said terminal equipment reports, then said receiver module receives 1 the CQI information that said terminal equipment reports.
32. base station as claimed in claim 31 is characterized in that,
Said determination module, the number of data streams that RI information that also is used for receiving according to said receiver module and said descending channel condition information are confirmed descending parallel transmission;
Said sending module also is used for according to the determined number of data streams of said determination module to said terminal equipment transmitting downlink data.
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