CN101867458B - The feedback method of channel condition information and device - Google Patents
The feedback method of channel condition information and device Download PDFInfo
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Abstract
The invention discloses a kind of feedback method and device of channel condition information, the method comprises: user equipment (UE) is to base station feedback order designator RI and broadband channel information, or feedback RI, broadband channel information and sub-band channel information, do are RI, broadband channel information, sub-band channel information carried on three different Report Type Report respectively? in Type; Wherein, the carrying precoding matrix indicators PMI in dicode basis is carried in broadband channel information and/or sub-band channel information.The feedback of two PMI can be realized by the present invention.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of feedback method and device of channel condition information.
Background technology
In a wireless communication system, transmitting terminal and receiving terminal take the mode of spatial reuse to use many antennas to obtain higher speed.Wherein a kind of technology strengthening spatial reuse is that receiving terminal feeds back to transmitting terminal channel information (also referred to as channel condition information), and transmitting terminal uses according to the channel information obtained launches precoding technique, can improve transmission performance.
At 3GPP Long Term Evolution (LongTermEvolution, referred to as LTE) in the works, the feedback of channel information mainly utilizes the feedback method of better simply single code book, and the performance of the transmitting precoding technique of multiple-input and multiple-output (Multi-inputMulti-output, referred to as MIMO) depends on the accuracy of wherein code book feedback.
Brief description is carried out to the general principle that the channel information based on code book quantizes to feed back below.
Suppose that Limited Feedback channel capacity is Bbps/Hz, so can the number of code word be N=2
bindividual.The space of feature vectors of channel matrix is through quantizing to form codebook space
.Transmitting terminal and receiving terminal are jointly preserved or are produced this code book in real time
(transmitting terminal is identical with receipts receiving end).To the channel H needing feeding back channel state information (CSI), receiving terminal according to certain criterion from codebook space
middle selection code word of mating most with actual channel H
and by this code word
sequence number i (code word sequence number) feed back to transmitting terminal.Here, code word sequence is known as the precoding matrix indicators (PrecodingMatrixIndicator, referred to as PMI) in code book.Transmitting terminal finds corresponding pre-encoding codeword according to this sequence number i
thus also obtain corresponding channel information,
illustrate the characteristic vector information of channel.In general codebook space
can be divided into the code book that multiple order (Rank) is corresponding further, under each Rank, the corresponding multiple code word of meeting quantizes the pre-coding matrix that this Rank lower channel characteristic vector is formed.Because the Rank of channel and non-zero characteristics vector number are equal, therefore, when in general Rank is N, code word all can have N to arrange.So, codebook space
multiple sub-codebook can be divided into by the difference of Rank, as shown in table 1.
Table 1
Wherein, need the code word stored to be all matrix form when Rank > 1, code book wherein in LTE protocol is exactly the feedback method of this codebook quantification adopted, and in fact in LTE, precoding codebook is the same with channel information quantization codebook implication.Wherein, vector also can regard a dimension as is the matrix of 1.
In the standard of LTE, the minimum feedback unit of channel information is subband (Subband), a subband is by several Resource Block (ResourceBlock, referred to as RB) composition, each RB is made up of multiple Resource Unit (ResourceElement, referred to as RE); RE is the least unit of running time-frequency resource in LTE.Object corresponding during UE feedback channel information can be subband, or multiple subband (Multi-Subband), and broadband (Wideband).
In LTE system, there is a lot of feedback model, under different transmission modes, have different feedback models.During spatial reuse, the feedback content of uplink channel information mainly contains three kinds:
PMI information, characteristic feature Vector Message, recommends base station, for downlink precoding technology; Order designator (RankIndicator, referred to as RI), characterizes the order of channel, recommends the number of plies of base station as descending support, wherein, and maximum support RI=4 during LTE; CQI (ChannelQualityIndicator, referred to as CQI), characterize the quality information of channel, with the modulation coding mode recommended to characterize channel quality, more the modulation coding mode of high-order represents that performance is better, supports 16 kinds of selections.As following table
Wherein, the feedback of channel information is divided into following two kinds: periodic feedback, is mainly carried on the feedback on ascending control channel (PUCCH); Non-periodic feedback, is carried on the feedback on Uplink Shared Channel (PUSCH).Below the periodic feedback on PUCCH is described.
In LTE system, PUCCH upper signal channel information feed back one has CQI, Type2 that 4 kinds of feedback kind Type:Type1 feed back the subband that UE select and feeds back the CQI in broadband and PMI information, Type3 feeds back RI information, Type4 only feeds back broadband CQI.Fig. 1 is the schematic diagram of the feedback form of correspondence two kinds of feedback models according to the LTE system of correlation technique.
Wherein, report (Report) type3RI information is absolute coding, such as, use under 4 transmitting antennas 2bit totally 4 state representation RI be 1,2, the situation of 3,4.
Comprise the PMI information of 4bit in Reporttype2, certain code word in instruction LTE code book, also comprises CQI information in addition.Be 2 CQI when being 1 CQI, RI > 1 during RI=1.Be 4bit during 1 CQI, during feedback 2 CQI, the 2nd CQI uses differential technique, based on the 1st CQI difference, is 3bit.Be 11bit to the maximum, this is also the maximum supported expense of CSI information when feeding back on PUCCH.
3bit differential CQI is defined as follows table
| Spatial differential CQI value | Offset level |
| 0 | 0 |
| 1 | 1 |
The positional information of sub-band CQI information and subband is comprised, the channel quality of instruction subband and position in Reporttype1.During RI=1, each subband comprises the CQI information of 1 4bit and the positional information of Lbit current sub-band, i.e. 4+Lbit; During RI > 1, each subband is except the positional information of the CQI information and Lbit current sub-band that comprise 1 4bit, also comprises the differential CQI information of a 3bit, always total 7+Lbit.Although L is relevant with the size of bandwidth, subband CQI and the total load of subband positional information can not more than the expenses of maximum 11bit supported on PUCCH.
Senior Long Term Evolution (LongTermEvolutionAdvanced, referred to as the LTE-A) system bandwidth (reaching as high as 100MHz) that system support is larger, and the existing standard of backward compatibility LTE.In order to improve covering and the throughput of cell edge, LTE-A is on the basis of existing LTE system, maximum 8 antennas have been arrived in descending support, and RI=8, and feeding back and proposing the technology that some feed back enhancing, mainly strengthen the feedback accuracy of code book, this technology can improve ternational Mobile Telecommunications (InternationalMobileTelecommunications-Advance, referred to as the IMT-Advance) system of evolution the availability of frequency spectrum, alleviate frequency spectrum resource in short supply.
Below the technology in lte-a system is described.
1) precoding/feedback arrangement of a subband is made up of two matrixes.
2) each matrix in two matrixes is under the jurisdiction of an independent code book.Code book is known by base station and UE simultaneously in advance.Code book can change to some extent on different time and different subbands.
3) a matrix notation broadband or long time channel attribute.On another matrix notation determination frequency band or the in short-term attribute of channel.
4) the matrix code book used represents with the form of limited denumerable matrix stack, and for UE and base station, each matrix is known.
From the above, in lte-a system, the feedback aspect of channel information proposes a kind of based on dicode structure originally, is explained below.
For needing feedback channel information subband or multiple associating subband, UE, to terminal feedback at least two PMI information, is respectively PMI1 and PMI2, the code word W 2 in code word W 1, the PMI2 corresponding another one code book C2 wherein in the corresponding code book C1 of PMI1.Base station end has the information of identical C1 and C2, find corresponding code word W 1 and W2, and functional rule F (W1, W2) according to a preconcerted arrangement obtains channel information after receiving PMI1 and PMI2 from code book C1 and C2 of correspondence.
Therefore, in lte-a system, under supporting the transmission mode of SU/MU, need in broadband/many sub-band channel information of feedback, need the channel information of transmission to have RI, PMI1 and PMI2 and CQI.
Due to PUCCH being conditional to the feedback quantity of channel condition information, only can support that single PMI feedback (does not consider the situation not having PMI to feed back here, such as pattern 1-0 and 2-0), therefore need to solve the feedback how supporting two PMI for have employed the situation strengthening code book.
Summary of the invention
Main purpose of the present invention is the feedback scheme providing a kind of channel condition information, at least to solve the problem.
According to an aspect of the present invention, provide a kind of feedback method of channel condition information, be applied to the transmission mode supporting Closed-Loop Spatial Multiplexing in senior Long Term Evolution lte-a system, the method comprises: user equipment (UE) is to base station feedback order designator RI and broadband channel information, or, feedback RI, broadband channel information and sub-band channel information, described RI, described broadband channel information, described sub-band channel information are carried in three different Report Type ReportType respectively; Wherein, the carrying precoding matrix indicators PMI in dicode basis is carried in described broadband channel information and/or described sub-band channel information.
According to a further aspect in the invention, additionally provide a kind of feedback device of channel condition information, comprising: module is set, for arranging the carrying precoding matrix indicators PMI in dicode basis in described broadband channel information and/or described sub-band channel information; Feedback module, for to base station feedback order designator RI and broadband channel information, or feedback RI, broadband channel information and sub-band channel information, described RI, described broadband channel information, described sub-band channel information are carried in three different Report Type ReportType respectively.
Pass through the present invention, adopt user equipment (UE) to base station feedback order designator RI and broadband channel information, or feedback RI, broadband channel information and sub-band channel information, RI, broadband channel information, sub-band channel information are carried in three different Report Type ReportType respectively; Wherein, the carrying precoding matrix indicators PMI in dicode basis is carried in broadband channel information and/or sub-band channel information.Solve in correlation technique the problem cannot supporting two PMI feedbacks, and then the feedback of two PMI can be realized.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the feedback form of correspondence two kinds of feedback models according to the LTE system of correlation technique;
Fig. 2 is the structured flowchart of the feedback device of channel condition information according to the embodiment of the present invention;
Fig. 3 is the flow chart of the feedback method of channel condition information according to the embodiment of the present invention two;
Fig. 4 is the schematic diagram of the information feedback mode according to the embodiment of the present invention four;
Fig. 5 is the schematic diagram of the information feedback mode according to the embodiment of the present invention five.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment one
Provide a kind of feedback method of channel condition information in the present embodiment, be applied to the transmission mode supporting Closed-Loop Spatial Multiplexing in senior Long Term Evolution lte-a system, this flow process comprises: user equipment (UE) is to base station feedback order designator RI and broadband channel information, or feedback RI, broadband channel information and sub-band channel information, RI, broadband channel information, sub-band channel information are carried in three different Report Type ReportType respectively; Wherein, the carrying precoding matrix indicators PMI in dicode basis is carried in broadband channel information and/or sub-band channel information.
Achieved the feedback of two PMI in dicode basis by said method, and can realize LTE system compatible.
Preferably, the content of carrying in broadband channel information and/or sub-band channel information is determined according to the RI of previous moment by ReportType.
It should be noted that, the method for the present embodiment, PMI1+PMI2+CQI has likely exceeded the load of supported maximum 11bit on PUCCH, need PUCCH dilatation, now, need to change the feedback signaling structure of LTE, and then cause the change of standard, real-time performance and equipment larger.
To this, following preferred implementation can be adopted: if the bit number of sub-band channel information or broadband channel information is greater than the maximum load bit number that ascending control channel PUCCH supports, then reduce the bit number of the differential CQI in sub-band channel information or broadband channel information, the bit number that differential CQI reduces is for feeding back the PMI in dicode basis.Can better compatible LTE system by this preferred implementation.
Below the ReportType of carrier band channel information and sub-band channel information ReportType is described respectively.
As the RI <=N of previous moment, N be not more than 8 positive integer, the ReportType of carrying sub-band channel information comprises following information: sub-band channel quality designator CQI information, the PMI2 in dicode basis and the positional information of predetermined number of bits.
Preferably, PMI2 is 1 or 2 bits; If the RI of previous moment equals 1, then sub-band CQI information feeds back 4 bits of a streams of code words; If the RI > 1 of N >=previous moment, then sub-band CQI information is the differential CQI of 0 bit of 4 bits with relative and the first streams of code words of feedback the second streams of code words of feedback first streams of code words, 1 bit or 2 bits.
As the RI > N of previous moment, N be not more than 8 positive integer, carrying sub-band channel information ReportType comprises following information: the positional information of sub-band CQI information, predetermined bit quantity.
Preferably, when RI > 2, carrying sub-band channel information ReportType comprises following information: the positional information of sub-band CQI information, predetermined bit quantity and solid size PMI (that is, the PMI of subband) originally.
As the RI <=N of previous moment, N be not more than 8 positive integer, carrying broadband channel information ReportType comprises following information: this PMI1, this PMI2 of dicode of broadband CQI information, dicode.Preferably, PMI1 is the bit of predetermined quantity; PMI2 is 1 or 2 bits; If the RI of previous moment equals 4 bits that 1, SubbandCQI information is a feedback streams of code words; If RI > 1, the SubbandCQI information of N >=previous moment is the differential CQI of 0 bit of 4 bits with relative and the first streams of code words of feedback the second streams of code words of feedback first streams of code words, 1 bit or 2 bits.
Preferably, above-mentioned 2bit differential CQI is: value be 0 side-play amount corresponding to differential CQI be 0; Value be 1 side-play amount corresponding to differential CQI be 1; Value be 2 side-play amount corresponding to differential CQI be 2; Value be 3 side-play amount corresponding to differential CQI be-1.
As the RI > N of previous moment, N be not more than 8 positive integer, carrying broadband channel information ReportType comprises following information: this PMI information of broadband CQI information, solid size.
In the present embodiment, additionally provide a kind of feedback device of channel condition information, Fig. 2 is the structured flowchart of the feedback device of channel condition information according to the embodiment of the present invention, as shown in Figure 2, this device comprises: arrange module 22, feedback module 24, be explained below.
Module 22 is set, for arranging the carrying precoding matrix indicators PMI in dicode basis in broadband channel information and/or sub-band channel information; Feedback module 24 is connected to and arranges module 22, for to base station feedback order designator RI and broadband channel information, or feedback RI, broadband channel information and sub-band channel information, RI, broadband channel information, sub-band channel information are carried in three different Report Type ReportType respectively.
Preferably, the content of carrying in broadband channel information and/or sub-band channel information is determined according to the RI of previous moment by ReportType.
Preferably, arrange module 22 also for be greater than at the bit number of sub-band channel information or broadband channel information ascending control channel PUCCH support maximum load bit number, reduce the bit number of the differential CQI in sub-band channel information or broadband channel information, and the bit number that differential CQI reduces is used for feed back the PMI in dicode basis.
Embodiment two
In the present embodiment, the maximum load bit number of ascending control channel support is greater than to the bit number of channel condition information and is less than or equal to maximum load bit number and is illustrated respectively, provide a kind of feedback method of channel condition information in the present embodiment, the method is applied to senior Long Term Evolution lte-a system, Fig. 3 is the flow chart of the feedback method of channel condition information according to the embodiment of the present invention two, and this flow process comprises the steps:
Step S302, when the bit number of the channel condition information needing feedback is greater than the maximum load bit number of ascending control channel PUCCH support, reduce the bit number of the differential CQI in described channel condition information, wherein, the bit number that differential CQI reduces is used for feeding back precoding matrix designator PMI;
Step S304, according to the feedback kind Type feeding back precoding matrix designator PMI adopted in Long Term Evolution LTE system and differential CQI.
By above-mentioned steps, the maximum load bit number that the bit number of feeding back channel state information can be made to be less than or equal to PUCCH support, thus can minimize dropping to the change demand of standard, real-time performance and equipment.Further, in the process that the present embodiment is implemented, inventor finds, when use two codeword transmission, under dual polarized antenna configuration, two CQI performances of channel are very close; And under adopting ULA antenna configuration, be all generally 0.5lamda strong correlation channel, Rank be greater than 1 situation less, therefore, can adopt and reduce the method for differential CQI and reach the object of saving signaling consumption, thus support that dicode this time transmits the situation of two PMI simultaneously.
It should be noted that, the situation that above-mentioned steps exceedes for the bit number of feeding back channel state information the maximum load bit number that PUCCH supports is illustrated, when be no more than maximum meet bit number, can feed back according to the situation of reality.Certainly, preferably, when the bit number of the channel condition information needing feedback is less than or equal to the maximum load bit number of PUCCH support, can according to the feedback kind feedback PMI adopted in LTE system and differential CQI.Adopt this processing mode, the compatibility to LTE system can be accomplished.
Such as, if the channel condition information needing feedback is broadband CQI and PMI, then, when RI is greater than 2, adopt the feedback system of single code book, feed back PMI in single code book and differential CQI according to the feedback kind adopted in LTE system; If the channel condition information needing feedback is broadband CQI and PMI, then when RI equals 1, according to a PMI, the 2nd PMI and differential CQI in the feedback kind feedback dicode basis adopted in LTE system.
Again such as, if need feedback channel condition information be subband CQI, then when RI equal 1 or be greater than 2, by need feedback PMI join in the feedback kind of subband CQI.
To needing, the channel condition information of feedback is broadband CQI and PMI, subband CQI is described respectively below.
If the channel condition information needing feedback is broadband CQI and PMI, the bit carrying PMI in CQI and PMI of broadband feeds back the PMI of dicode in this, and, reduce the bit number of the differential CQI in CQI and PMI of broadband, the bit number that differential CQI reduces is for feeding back the 2nd PMI in dicode basis.If the channel condition information needing feedback is subband CQI, reduce the bit number of the differential CQI in subband CQI, the bit number that differential CQI reduces is for feeding back the PMI of dicode in this; Use another PMI in the bit feedback dicode basis carrying PMI in CQI and PMI of broadband.
Preferably, the bit number that differential CQI reduces is 1 bit or 2 bits.
Preferably, when order designator RI equals 2, the bit number that differential CQI reduces is 3 bits.
Embodiment three
A kind of feedback method of channel condition information is provided in the present embodiment.In the present embodiment, lte-a system adopts this feedback technique of dicode strengthened, and two PMI are wherein expressed as PMI1 and PMI2 and indicate pre-coding matrix in two code books respectively.If do not use this feedback technique of dicode of enhancing, then only employing PMI indicates the pre-coding matrix in code book.
Information feedback structure in lte-a system in the present embodiment on PUCCH adopts the signaling feedback structure in LTE system.When needing the bit number of CQI+PMI of feedback to be no more than the supported maximum load bit number of PUCCH, the position of feeding back PMI in LTE system is fed back the PMI of lte-a system; When needing the bit number of CQI+PMI of feedback maximum load bit number supported more than PUCCH, reduce feedback differential CQI bit number thus in LTE system feedback differential CQI position on feed back differential CQI and the PMI of lte-a system.Wherein, the implication of the PMI indication of lte-a system comprises PMI1, PMI2, PMI1+PMI2 or PMI.PMI1 is generally 4bit; The PMI2 strengthening code book as instruction is generally 1bit or 2bit; 2bit or 3bit is generally not adopting this time of dicode of enhancing (during as RI > 2) PMI.
Below to needing the channel condition information fed back to be that WidebandCQI/PMI and SubbandCQI illustrates respectively.
The channel condition information needing feedback when system is WidebandCQI/PMI.
When RI=1, feed back needing the PMI1+PMI2 fed back directly to be placed in LTE system in lte-a system on the position of WidebandPMI.
When RI=2, feed back needing the PMI1 fed back to be placed in LTE system in lte-a system on the position of WidebandPMI.Reduce the differential CQI bit number needing feedback, thus carrying needs the PMI2 of feedback.
Wherein differential CQI can be reduced to 1bit or 2bit.
When RI > 2, feed back needing the PMI fed back directly to be placed in LTE system in lte-a system on WidebandPMI position.
When the channel condition information that system needs feedback is SubbandCQI, the PMI2 information strengthening code book is added and feeds back, thus the attribute of instruction place subband.Namely SubbandCQI+ subband positional information+PMI is fed back.
When RI=1, directly add needing the PMI2 information of feedback in the feedback type of SubbandCQI.
When RI=2, reduce the differential CQI bit number needing feedback, thus carrying needs the PMI2 information of feedback.
Wherein differential CQI can be reduced to 1bit or 2bit.
When RI > 2, directly add needing the PMI information of feedback in the feedback type of SubbandCQI.
By adopting the information feedback mode of the present embodiment, simple and effective feeding back channel state information under the prerequisite of new feedback kind can be introduced in PUCCH not dilatation and not, well inherit the signaling feedback structure of LTE, make to have dropped to the change demand of standard, real-time performance and equipment to minimize.
Embodiment three and embodiment four are described for information feedback during Rank=1/2/3 under Closed-Loop Spatial Multiplexing transmission mode.
Embodiment four
Fig. 4 is the schematic diagram of the information feedback mode according to the embodiment of the present invention four, when the channel condition information that system needs feedback is WidebandCQI/PMI:
During RI=1, the position of the PMI fed back in LTE system is transmitted PMI1 and the PMI2 information that lte-a system needs feedback.
Because the PMI information in LTE system is 4bit, according to discussing the common recognition reached at present in lte-a system, PMI1 is generally 4bit, and PMI2 is generally 1bit or 2bit.Therefore on the position of carrying LTEPMI, transmit the 11bit that PMI1+PMI2 can not maximumly more than PUCCH carry.
During RI=2, feed back needing the PMI1 fed back to be placed in LTE system in lte-a system on the position of WidebandPMI.Reduce the differential CQI bit number needing feedback, thus carrying needs the PMI2 of feedback.
Owing to needing feedback differential CQI information during RI=2, differential CQI expense can be reduced 1bit or 2bit by the actual conditions according to channel, and the expense saved is for transmitting PMI2 information.Because the PMI information in LTE system is 4bit, according to the common recognition reached is discussed at present in lte-a system, PMI1 is generally 4bit, PMI2 is generally 1bit or 2bit, is therefore transmitted on the position of LTEPMI by PMI1, the 11bit that can not maximumly more than PUCCH carry is transmitted in the position of 1bit/2bit that the PMI2 of 1bit/2bit saves in differential CQI.
During RI=3, feed back needing the PMI fed back directly to be placed in LTE system in lte-a system on WidebandPMI position.
In the present embodiment, this feedback system of dicode of enhancing can not be adopted during RI=3, and adopt single code book.Because the PMI information in LTE system is that the solid size adopted in 4bit, LTE-A high order situation is originally generally no more than 3bit, on the position of carrying LTEPMI, therefore transmit the 11bit that LTE-APMI can not maximumly more than PUCCH carry.
Embodiment five
Fig. 5 is the schematic diagram of the information feedback mode according to the embodiment of the present invention five.When the channel condition information that system needs feedback is SubbandCQI:
The PMI2 information strengthening code book is added and feeds back, thus the attribute of instruction place subband.Namely SubbandCQI+ subband positional information+PMI is fed back.
During RI=1, directly add needing the PMI2 information of feedback in the feedback type of SubbandCQI.
Because the SubbandCQI information in LTE system is 4+Lbit, although L is relevant with the size of bandwidth, can not more than 2bit.And PMI2 is generally 1bit or 2bit, in subbandCQI feedback information, therefore directly add the 11bit that PMI2 can not maximumly more than PUCCH carry.
When RI=2, reduce the differential CQI bit number needing feedback, thus carrying needs the PMI2 information of feedback.
Owing to needing feedback differential CQI information during RI=2, differential CQI expense can be reduced 1bit or 2bit by the actual conditions according to channel, and the expense saved is for transmitting PMI2 information.
Because the SubbandCQI information in LTE system is 7+Lbit, wherein CQI4bit, differential CQI 3bit, L are so relevant with the size of bandwidth, but can not more than 2bit.The 11bit that the PMI2 information that 1bit/2bit is transmitted in the position of the 1bit/2bit therefore saved in differential CQI can not maximumly more than PUCCH carry.
During RI=3, directly add needing the PMI information of feedback in the feedback type of SubbandCQI.
In the present embodiment, do not adopt this feedback system of dicode of enhancing during RI=3, and adopt single code book.Because the SubbandCQI information in LTE system is 7+Lbit, wherein CQI4bit, differential CQI 3bit, although L is relevant with the size of bandwidth, can not more than 2bit.Therefore in subbandCQI feedback information, directly add the 11bit that PMI information can not maximumly more than PUCCH carry.
In sum, pass through the above embodiment of the present invention, solve PMI1+PMI2+CQI in correlation technique exceeded supported maximum load on PUCCH and caused needing to change larger problem to standard, network time limit and equipment, and then can minimize dropping to the change demand of standard, real-time performance and equipment.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a feedback method for channel condition information, is applied to the transmission mode supporting Closed-Loop Spatial Multiplexing in senior Long Term Evolution lte-a system, it is characterized in that, comprising:
User equipment (UE) is to base station feedback order designator RI and broadband channel information, or feed back described RI, described broadband channel information and sub-band channel information, described RI, described broadband channel information, described sub-band channel information are carried in three different Report Type ReportType respectively; Wherein, when described UE is to RI described in described base station feedback and described broadband channel information, the carrying precoding matrix indicators PMI in dicode basis is carried in described broadband channel information; At described UE to described in described base station feedback when RI, described broadband channel information and described sub-band channel information, the PMI of described dicode in this is carried in described broadband channel information and/or described sub-band channel information;
Wherein, the described dicode PMI in this comprises: the PMI1 of dicode in this and the dicode PMI2 in this.
2. method according to claim 1, is characterized in that, the content of carrying in described broadband channel information and/or described sub-band channel information is determined according to the RI of previous moment by ReportType.
3. method according to claim 2, it is characterized in that, as the RI<=N of described previous moment, N be not more than 8 positive integer, the ReportType carrying described sub-band channel information comprises following information: sub-band channel quality designator CQI information, the PMI2 in described dicode basis and the positional information of predetermined number of bits.
4. method according to claim 3, is characterized in that,
Described PMI2 is 1 or 2 bits;
If the RI of described previous moment equals 1, then described sub-band CQI information feeds back 4 bits of a streams of code words; If the RI>1 of previous moment described in N>=, then described sub-band CQI information is the differential CQI of 0 bit of 4 bits with relative and the first streams of code words of feedback the second streams of code words of feedback first streams of code words, 1 bit or 2 bits.
5. method according to claim 2, it is characterized in that, as the RI>N of described previous moment, N be not more than 8 positive integer, carry described sub-band channel information ReportType and comprise following information: the positional information of sub-band CQI information, predetermined bit quantity.
6. method according to claim 5, it is characterized in that, as the RI>2 of described previous moment, carry described sub-band channel information ReportType and comprise following information: the positional information of described sub-band CQI information, described predetermined bit quantity, solid size PMI originally.
7. method according to claim 2, it is characterized in that, as the RI<=N of described previous moment, N be not more than 8 positive integer, carry described broadband channel information ReportType and comprise following information: this PMI1, this PMI2 of described dicode of broadband CQI information, described dicode.
8. method according to claim 7, is characterized in that,
Described PMI1 is the bit of predetermined quantity; Described PMI2 is 1 or 2 bits;
If the RI of described previous moment equals 1, described broadband CQI information is 4 bits of a feedback streams of code words; If the RI>1 of previous moment described in N>=, described broadband CQI information is the differential CQI of 0 bit of 4 bits with relative and the first streams of code words of feedback the second streams of code words of feedback first streams of code words, 1 bit or 2 bits.
9. the method according to claim 4 or 8, is characterized in that, described 2 bit differential CQI are: value be 0 side-play amount corresponding to differential CQI be 0; Value be 1 side-play amount corresponding to differential CQI be 1; Value be 2 side-play amount corresponding to differential CQI be >=2; Value be 3 side-play amount corresponding to differential CQI for≤-1.
10. method according to claim 2, it is characterized in that, as the RI>N of described previous moment, N be not more than 8 positive integer, carry described broadband channel information ReportType and comprise following information: this PMI information of broadband CQI information, solid size.
The feedback device of 11. 1 kinds of channel condition informations, is characterized in that, comprising:
Module is set, for when to base station feedback order designator RI and broadband channel information, carrying precoding matrix indicators PMI in dicode basis is set in described broadband channel information, to described in described base station feedback when RI, described broadband channel information and sub-band channel information, the carrying precoding matrix indicators PMI of dicode in this is set in broadband channel information and/or sub-band channel information;
Feedback module, for to RI described in base station feedback and described broadband channel information, or, feed back described RI, described broadband channel information and described sub-band channel information, described RI, described broadband channel information and described sub-band channel information are carried in three different Report Type ReportType respectively;
Wherein, the described dicode PMI in this comprises: the PMI1 of dicode in this and the dicode PMI2 in this.
12. devices according to claim 11, is characterized in that, the content of carrying in described broadband channel information and/or described sub-band channel information is determined according to the RI of previous moment by ReportType.
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| CN102468929B (en) * | 2010-11-15 | 2014-10-08 | 中国移动通信集团公司 | Downlink MIMO (multiple-input multiple-output) broadband channel state information feedback method and device and equipment |
| CN102468928B (en) * | 2010-11-15 | 2014-07-02 | 中国移动通信集团公司 | Feedback method, device and equipment for downlink multiple input multiple output (MIMO) sub-band signal channel state information |
| CN102111246B (en) * | 2011-01-12 | 2017-03-29 | 中兴通讯股份有限公司 | The method and user equipment of feeding back channel state information |
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| US9559820B2 (en) * | 2011-02-18 | 2017-01-31 | Qualcomm Incorporated | Feedback reporting based on channel state information reference signal (CSI-RS) groups |
| US20130288686A1 (en) * | 2011-04-29 | 2013-10-31 | Joey Chou | Techniques to manage energy savings for interoperable radio access technology networks |
| CN102271031B (en) * | 2011-08-09 | 2018-02-06 | 中兴通讯股份有限公司 | A kind of method and system of feedback of channel information |
| CN102263583A (en) * | 2011-08-19 | 2011-11-30 | 电信科学技术研究院 | Method for sending and receiving channel state information (CSI), system and equipment thereof |
| CN103636156B (en) * | 2012-05-11 | 2017-05-17 | 太阳专利信托公司 | Wireless communication method for reporting channel state information and user equipment |
| CN114257341B (en) * | 2013-05-24 | 2023-08-29 | 中兴通讯股份有限公司 | Channel state information feedback method and terminal |
| CN105530036B (en) | 2014-09-28 | 2019-04-02 | 电信科学技术研究院 | Channel state information feedback method, equipment and system |
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| CN107888324A (en) * | 2016-09-29 | 2018-04-06 | 株式会社Ntt都科摩 | By mobile station, the feedback and method of reseptance of base station execution, mobile station and base station |
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