CN102291222A - Method, device and system for feeding back precoding matrix indication - Google Patents
Method, device and system for feeding back precoding matrix indication Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for feeding back a precoding matrix indication (PMI), through which the accuracy of the PMI fed back through a terminal side can be improved. The method is applied to a multi-carrier system, wherein the system bandwidth of the multi-carrier system is divided into at least two frequency bands; each frequency band includes a plurality of subbands; after the number of the frequency bands in the system is determined by the terminal, a corresponding broad band codebook and a corresponding subband codebook of each frequency band are respectively chosen by the teminal, and then the corresponding broad band codebook and the corresponding subband codebook of each frequency band are reported to a network side as the PMI. In this way, compared with the traditional mechanism in which one PMI is fed back in the whole system bandwidth, the accuracy of the PMI which is fed back is improved greatly, the network environment of each frequency band in the system bandwidth can be obtained accurately through the network side according to the PIM which is reported through the terminal and consequently a corresponding precoding matrix can be chosen through the network side and then the precoding gain is effectively improved. The invention simultaneously discloses the device for feeding back the PMI and the system for feeding back the PMI.
Description
Technical field
The present invention relates to the communications field, particularly a kind of feedback method of channel quality, Apparatus and system.
Background technology
Adopting OFDM (Orthogonal Frequency Division Multiplexing, OFDM) in the system of technology, as, senior upgrading evolution (LTE) system, a plurality of data symbols can send on different subcarriers simultaneously, and the frequency interval of subcarrier can guarantee the orthogonality between a plurality of data symbols just.The OFDM modulator is converted to the data symbol stream of input by string and conversion the data symbol stream of multidiameter delay.The output of string and conversion can be considered 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 status, thereby realizes coherent demodulation.
(Orthogonal Frequency Division Multiple Access, OFDMA) technology is based on a kind of multiple access transmission technology of OFDM technology to OFDM.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 realizes the orthogonal transmission between the user with on the different resource piece of different terminal schedulings in the system bandwidth scope.
Under the 3GPP standard, the LTE system descending adopts the OFDMA technology, and 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 be a basic resources unit (resource element, RE).The minimum resource allocation unit of LTE system definition is that (Physical Resource Block PRB), comprises the RE of 12 continuous on interior all the OFDM symbols of subframe subcarrier correspondences to Physical Resource Block.Terminal may be scheduled for continuous or discontinuous Physical Resource Block on.
In LTE Rel-8 standard, the LTE system has introduced the closed loop precoding technique to improve spectrum efficiency.The closed loop precoding at first requires the set of all preserving same pre-coding matrix in base station and terminal, is called code book.After terminal estimates channel condition information according to cell common pilots, from code book, select a pre-coding matrix by certain criterion.The criterion of choosing can be based on maximization mutual information amount and choose, chooses or the like based on maximization output Signal to Interference plus Noise Ratio.Terminal feeds back to the base station with the index of pre-coding matrix in code book of selecting by up channel, and this index is designated as pre-coding matrix indication (Precoding MatrixIndicator, PMI).The base station just can be determined the pre-coding matrix that should use this terminal after by the PMI that receives, the pre-coding matrix of terminal to report can be regarded as the quantized value of channel condition information.
For obtaining optimum performance, the pre-coding matrix of terminal to report should be tried one's best and channel status is complementary, and this just means that the pre-coding matrix of terminal to report should adapt to the channel variation in the transmission bandwidth scope.Change comparatively mild environment for the frequency domain of non-frequency-selective channel or channel, terminal can only report a pre-coding matrix, corresponding whole system bandwidth.That is to say no matter terminal scheduling can carry out preliminary treatment to data with the pre-coding matrix of terminal to report to which interior subband of entire belt wide region.For frequency-selective channel, terminal should report a plurality of pre-coding matrixes, and a part of frequency band in the corresponding system bandwidth scope of each pre-coding matrix is called subband.During downlink data transmission,, then should carry out preliminary treatment to data with the pre-coding matrix of this subband correspondence if terminal is scheduled on a certain subband.
The frequency domain granularity of terminal feedback is meant the frequency domain scope of the pre-coding matrix correspondence of feedback, corresponding pre-coding matrix calculates according to the channel condition information in this frequency domain scope, and the data of the transmission in this frequency domain scope should be carried out preliminary treatment according to the pre-coding matrix of feedback.As previously mentioned, the frequency domain granularity of feedback can be whole system bandwidth or subband.If the frequency domain granularity of feedback is the whole system bandwidth, then be called the broadband feedback, the channel condition information of its feedback is called wide-band-message; If the frequency domain granularity of feedback is a subband, then be called the subband feedback, the channel condition information of its feedback is called sub-band information.
In order to satisfy the high-precision requirement of MIMO to channel condition information, the feedback quantity of increase channel information within reason has proposed the scheme that a kind of multi-granule feeds back in the formulation process of LTE Rel-10 standard simultaneously.The pre-coding matrix that is terminal to report is divided into broadband and subband two parts, and broadband and sub-band information obtain final subband pre-coding matrix by a mapping:
Wherein
Be the matrix function of describing mapping relations,
With
Be respectively wide-band-message and sub-band information.
With
Respectively from different code book C
1And C
2In choose
In the multi-granule feedback scheme, the final pre-coding matrix of each subband all needs according to wide-band-message
And sub-band information
Calculate.The sub-band information of different sub-band
Can be different, the wide-band-message of using on several continuous subbands
But be identical,
Identical depending in much scopes
Granularity, for example, if
Granularity be system bandwidth, then the wide-band-message of using on each subband in the whole system bandwidth range all is identical.The effective precondition of multi-granule feedback scheme is,
All be effective in the whole system bandwidth range.Under desirable condition,
Really be all to be effective in the entire belt wide region.
But, in the system of reality, all can there be certain difference between the radio-frequency transmissions circuit transfer function of any two antennas of base station, specifically, time delay and amplitude be difference to some extent all.Shi Yanhui causes the phase place rotation in the frequency domain.If system bandwidth big (as, system bandwidth is 20MHz), so these since in the frequency domain that different delay causes between antenna phase place rotations can make that any one pre-coding matrix all can't be fit to the whole system bandwidth in the code book.For example, if code book 8-DFT (DFT, Discrete FourierTransform) vector, the phase difference between two then adjacent vectors is π/4, and the bandwidth range that can use same precoding vector so is
(the delay inequality maximum between the antenna of LTE system regulation can not surpass for 65 nanoseconds), promptly be about the 2MHz bandwidth; May also can not bring too big performance loss even consider deviation to adjacent pre-coding matrix, bandwidth range also far can not reach system bandwidth 20MHz.In this case, if only feed back broadband
Then will inevitably cause on some subbands
Do not match with the channel status of this subband, thereby the channel status of pre-coding matrix that finally obtains and subband does not match, like this, just make the base station can't obtain accurate pre-coding matrix, thereby can not get maximum precoding gain, and then cause systematic function to reduce.
Summary of the invention
The embodiment of the invention provides a kind of method, Apparatus and system that feeds back pre-coding matrix indication, in order to the accuracy of the pre-coding matrix indication that improves the end side feedback.
The concrete technical scheme that the embodiment of the invention provides is as follows:
A kind of method of feeding back the pre-coding matrix indication is applied to multicarrier system, and the system bandwidth of described multicarrier system is divided at least two frequency ranges, and each frequency range comprises some subbands, and this method comprises:
Terminal is obtained default frequency range and is divided relevant information, to determine intrasystem frequency range number;
Terminal is chosen corresponding broadband code book at each frequency range respectively;
Terminal is chosen corresponding subband code book based on the broadband code book of each frequency range respectively;
Terminal is with the broadband code book and the subband code book of each frequency range correspondence, and indication reports to network side as pre-coding matrix.
A kind of device that feeds back the pre-coding matrix indication is applied to multicarrier system, and the system bandwidth of described multicarrier system is divided at least two frequency ranges, and each frequency range comprises some subbands, and this device comprises:
Determining unit is used to obtain default frequency range and divides relevant information, to determine intrasystem frequency range number;
First chooses the unit, is used for choosing corresponding broadband code book at each frequency range respectively;
Second chooses the unit, is used for choosing corresponding subband code book based on the broadband code book of each frequency range respectively;
Report the unit, be used for broadband code book and subband code book with each frequency range correspondence, indication reports to network side as pre-coding matrix.
A kind of system of feeding back the pre-coding matrix indication, this system is a multicarrier system, and its system bandwidth is divided at least two frequency ranges, and each frequency range comprises some subbands, and this system comprises base station and terminal, wherein,
Terminal, be used to obtain default frequency range and divide relevant information, to determine intrasystem frequency range number, and choose corresponding broadband code book at each frequency range respectively, choose corresponding subband code book based on the broadband code book of each frequency range respectively again, and with the broadband code book and the subband code book of each frequency range correspondence, indication reports to network side as pre-coding matrix;
The base station is used for receiving terminal and reports the pre-coding matrix indication.
The embodiment of the invention reports mechanism a kind of aperiodic for the PMI of multi-granule feedback provides, different with existing mechanism, in the embodiment of the invention, system bandwidth is divided into some frequency ranges, broadband code book of each frequency range feedback and sub-tape code this as PMI, like this, compare under the current mechanism at PMI of whole system bandwidth internal feedback, improved the accuracy of the PMI of feedback greatly, make network side can accurately know the network environment of each frequency range in the system bandwidth according to the PMI of terminal to report, thereby can select the pre-coding matrix that adapts exactly, and then improve the precoding gain effectively.
Description of drawings
Fig. 1 is an embodiment of the invention Mid Frequency dividing mode schematic diagram;
Fig. 2 A is a LTE Solution Architecture schematic diagram in the embodiment of the invention;
Fig. 2 B is a termination function structural representation in the embodiment of the invention;
Fig. 3 is a terminal to report PMI flow chart in the embodiment of the invention.
Embodiment
In order to improve the accuracy at the pre-coding matrix indication of system bandwidth of end side feedback, in the embodiment of the invention, the whole bandwidth of system is divided into several frequency ranges, specifically as shown in Figure 1, can include a plurality of subbands in the frequency range, the subband size is relevant with system bandwidth to be defined in existing standard, and frequency range is the notion of redetermination in the embodiment of the invention here.Terminal all reports a broadband (or long time) information for each frequency range
The granularity that is the wide-band-message feedback is a frequency range, simultaneously, and for each frequency range all reports an arrowband (or in short-term) information
The granularity that is the narrow band information feedback also is a frequency range.
In the substandard LTERel-8/Rel-9 version of 3GPP, stipulate, ascending control channel (Physical Uplink Control Channel can be adopted by the high-level signaling configurating terminal in the base station, PUCCH) periodicity of carrying out channel condition information reports and/or adopts Uplink Shared Channel (Physical Uplink SharedChannel PUSCH) reports the aperiodic of carrying out channel condition information.Channel condition information based on the PUSCH channel in Rel-8 and the Rel-9 version reports mode can't finish the wide-band-message of a plurality of frequency ranges and reporting of sub-band information, in view of this, in the present embodiment, provided and a kind ofly can finish the wide-band-message of a plurality of frequency ranges and the channel condition information based on PUSCH that sub-band information reports reports mode.
Table 1
| Content | Size | Granularity | Number | Total?bits (RI＜＝2) | Total bits (RI＞2) |
| RI | 3 | |
1 | 3 | 3 |
| W1 | 4 | BS | 4 | 16 | 0 |
| W2forRI＜＝2 | 2 | BS | 4 | 8 | 0 |
| W2forRI＞2 | 4 | BS | 4 | 0 | 16 |
| Wideband?CQI?for?codeword1 | 4 | |
1 | 4 | 4 |
| Wideband?CQI?for?codeword2 | 4 | |
1 | 4 | 4 |
| subband?CQI?for?codeword1 | 2 | Sub?band | 14 | 28 | 28 |
| subband?CQI?for?codeword2 | 2 | Sub?band | 14 | 28 | 28 |
| Total | 91 | 83 | |||
| Total(report?CQI?for?codeword1only) | 59 | 51 |
In the Rel of LTE standard version, stipulate, in the LTE system, for the accuracy of the CSI that improves feedback, adopted two independently code book feed back PMI respectively, corresponding (or broadband) characteristic of channel when long and another correspondence be (or arrowband) characteristic of channel in short-term.Consult shown in the table 1, the code book of characteristic of channel when W1 represents correspondence long, W2 represents the corresponding code book of the characteristic of channel in short-term.The code book W1 of the characteristic of channel is made of the DFT vector substantially when corresponding long, and each DFT vector is being represented a specific beam direction, and the particular location of this direction and terminal can not change in closely related and a period of time.Under the associated antenna scene, especially under relevant dual polarized antenna configuration, Rank＜=2 are transmitted as the master; And Rank＞2 transmission opportunitys will improve under uncorrelated antenna scene, the characteristic of channel has just lost meaning because can not form the wave beam of a specific direction in this case when growing under uncorrelated antenna configurations so, and is therefore, as shown in table 1, Rank＞2 o'clock, W1 has not just fed back, has only fed back W2.
Consult shown in Figure 1ly, S represents all subband set, just equals system bandwidth; BS (BandSegment) represents frequency range, comprises some subbands, can be regarded as the subband set less than system bandwidth, can mark off a plurality of BS in the system bandwidth.RI represents rank (order) indication, so because the LTE-A system supports 8 flow transmission to represent with 3 bits at most, one of full bandwidth feedback.Code book W1 represents that with 4 bits promptly its code book is made of 16 elements when long, one of each BS (frequency range) feedback, and the whole system bandwidth is divided into 4 frequency ranges, so o'clock need feed back 16 bits altogether in RI＜=2.In RI＜=2 o'clock, code book W2 represents with 2 bits in short-term, and promptly its code book is made of 4 elements.In RI＞2 o'clock, code book W1 has not just fed back or has fixed one (unit matrix) when long, and code book W2 represents with 4 bits in short-term, and promptly its code book is made of 16 elements.W2 is one of a BS internal feedback, and whole like this bandwidth internal feedback 4 so, o'clock needs 8 bits altogether in rank＜=2, and rank＞2 o'clock need 16 bits altogether.One 4 bit broadband CQI of each space code word feedback, each subband feeds back the subband CQI of one or two space code words simultaneously, amounts to 14 groups of subband CQI.Difference subband CQI is the side-play amount with respect to broadband CQI.All needing under the situation of feedback of channel information altogether the bit number of feedback 2 space code words o'clock is 91 and 83 bits in rank＜=2 and rank＞2 respectively.Having only 1 space code word to need under the situation of feedback of channel information altogether the bit number of feedback o'clock is 59 and 51 bits in rank＜=2 and rank＞2 respectively.Needing number of bits of feedback under the situation of rank=1 altogether is 59.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Fig. 2 A, in the embodiment of the invention, be used for feeding back channel state information system (as, the LTE system) comprise several base stations and some terminals, this system is a multicarrier system, and its system bandwidth is divided at least two frequency ranges, each frequency range comprises some subbands, wherein
Terminal, be used to obtain default frequency range and divide relevant information, to determine intrasystem frequency range number, described frequency range comprises at least one subband, and choose corresponding broadband code book at each frequency range respectively, choose corresponding subband code book based on the broadband code book of each frequency range respectively again, and with the broadband code book and the subband code book of each frequency range correspondence, indication reports to network side as PMI;
The base station is used for the PMI that receiving terminal reports.
Consult shown in Fig. 2 B, in the embodiment of the invention, be used for feeding back channel state information device (as, UE) comprise that determining unit 20, first chooses unit 21, second and choose unit 22 and report unit 23, this device is applied to multicarrier system, and the system bandwidth of this multicarrier system is divided at least two frequency ranges, and each frequency range comprises some subbands, wherein
Determining unit 20 is used to obtain default frequency range and divides relevant information, and to determine intrasystem frequency range number, described frequency range comprises at least one subband;
First chooses unit 21, is used for choosing corresponding broadband code book at each frequency range respectively;
Second chooses unit 22, is used for choosing corresponding subband code book based on the broadband code book of each frequency range respectively;
Report the unit, be used for broadband code book and subband code book, report to network side as PMI with each frequency range correspondence.
Shown in Fig. 2 B, further comprise a computing unit 24 among the UE, be used for choosing unit 21 and choose corresponding broadband code book at each frequency range respectively first, and second choose unit 22 and choose corresponding subband code book based on the broadband code book of each frequency range respectively after, broadband code book and subband code book according to each frequency range correspondence, calculate the broad-band channel quality information that obtains at system bandwidth, and respectively according to the broadband code book and the subband code book of each frequency range correspondence, calculate the sub-band channel quality information set that obtains at each frequency range, and by reporting unit 23 that the sub-band channel quality information set of described broad-band channel quality information and each frequency range is reported to network side.
Based on the said system framework, in the embodiment of the invention, with the LTE system is example, and corresponding aperiodic channel status information (Channel State Information, CSI) feedback are triggered by " CQI request " bit in the descending control information format 0 (DCI format 0) in the base station.Specific practice is, DCI format 0 is arrived in UE blind check in subframe n, and check " CQI request " bit status among the DCI format 0, if state is " needing the CSI feedback ", then will in subframe n+k, feed back CSI aperiodic, comprise channel quality information (CQI)/pre-coding matrix indication (PMI)/order indication (RI).The modulation of concrete CQI, PMI and RI, coding, resource are shone upon all identical with Rel-8.In the present embodiment, the mode that reports of CQI and PMI has been made relevant optimization, consulted shown in Figure 3ly, terminal (being UE) is as follows to the detailed process of base station side feedback PMI:
Step 300: terminal is obtained at the default frequency range of system bandwidth and is divided relevant information, with the frequency range number P of determining that system bandwidth comprises.
In the present embodiment, above-mentioned frequency range is divided relevant information can also can notify terminal by broadcast mode by the base station by the base station by high-level signaling or physical layer signaling notice terminal in cell range.
Step 310: terminal is chosen corresponding broadband code book at each frequency range respectively, promptly
In the embodiment of the invention,
It is a best code book of in a frequency range, from group code basis, selecting with certain criterion, the criterion of choosing can set in advance, for example, choose, choose, choose or the like based on the maximization transinformation content based on maximize throughput based on maximization output Signal to Interference plus Noise Ratio, terminal feeds back to the base station with the index of pre-coding matrix in code book of selecting by up channel, this index is designated as PMI, for example, and the above-mentioned corresponding broadband of each frequency range code book that selects
Just can be regarded as PMI,, therefore will select P altogether because P frequency range arranged
To choose the broadband code book based on maximize throughput is example, is choosing on certain frequency range
The time, tentation data only transmits on this frequency range, terminal is determined corresponding RI (having default mapping relations between the intensity of pilot frequency information and the value of RI) according to pilot frequency information, determine optional code book set according to RI again to should RI being provided with, the span of RI is [1,8], can represent with 3 bits, the value difference of RI, its corresponding code book set is also different, then, terminal is calculated the throughput that selected code book is gathered all code book correspondences that comprise in above-mentioned frequency range, and selects a code book conduct of throughput maximum
Step 320: terminal is chosen corresponding subband code book, promptly respectively based on the broadband code book of each frequency range correspondence
In the present embodiment, choosing on certain frequency range
The time, only on this frequency range, transmit in the tentation data, and the broadband code book of using on this frequency range is what calculate at this frequency range in step 310
Wherein, in certain frequency range, choosing
Situation under select corresponding
Be existing
Hypothesis under carry out and also be one of a Frequency Band Selection, therefore, also can select P in the whole system bandwidth
Selecting certain frequency range
After, terminal will be determined the matrix function relation of appointment, in the present embodiment, the matrix function of appointment relation is
Terminal will be based on this matrix function relation and selected
Choose corresponding according to certain criterion
Suppose based on criterion be based on maximum throughput and choose, so, terminal will chosen
The time code book set used in, calculate each code book with
Carry out the throughput that obtains after the computing, and wherein code book of throughput maximum as choosing
Since final precoding vector (matrix) be by
With
Common formation, therefore, certain frequency range that selects in the manner described above
With
Can guaranteed performance the best.
For example, as shown in table 1, corresponding above-mentioned above W1 and W2 are corresponding respectively
With
With
Respectively from different code book C
1And C
2In choose, just refer to PMI.
Step 330: terminal reports to network side with the broadband code book and the subband code book of each frequency range correspondence as PMI.
The embodiment of the invention reports mechanism a kind of aperiodic for the PMI of multi-granule feedback provides, and different with existing mechanism, in the above-described embodiments, system bandwidth is divided into some frequency ranges, one of each frequency range feedback
With one
As PMI, like this, compare under the current mechanism at PMI of whole system bandwidth internal feedback, improved the accuracy of the PMI of feedback greatly, make network side can accurately know the network environment of each frequency range in the system bandwidth according to the PMI of terminal to report, thereby can select the pre-coding matrix that adapts exactly, and then improve the precoding gain effectively.
Based on the foregoing description, terminal is being chosen at each frequency range respectively accordingly
With
After, can further calculate acquisition at the broadband CQI of system bandwidth with at the subband CQI set of each frequency range, be specially:
At first, terminal is respectively based on each frequency range correspondence
With
Calculating is at the broadband CQI of system bandwidth.
When calculating broadband CQI, tentation data transmits in whole bandwidth, and adopts the pre-coding matrix of this frequency range correspondence on each frequency range respectively
Wherein
Be the broadband code book and the subband code book of this frequency range correspondence,
It is the matrix function of describing mapping relations.
The computational methods of CQI are as follows:
(1) calculate the Signal to Interference plus Noise Ratio (SINR) of each subcarrier,
Wherein, S is a signal energy, and I is an interfering energy, σ
2Be noise energy, in the practical application, also can replace SINR with signal to noise ratio (snr).
(2) SINR with N subcarrier fits to CQI.
The subband size is generally m PRB, and is a kind of example of CQI computational methods above m＜M (M is the PRB sum in the system bandwidth), and a PRB is that a Resource Block unit comprises the plurality of sub carrier wave here, and a subband comprises some PRB.Similar aforesaid method is asked its mean value after calculating the frequency range CQI of correspondence of each frequency range, and this mean value is the broadband CQI at the whole system bandwidth.
Secondly, terminal is respectively based on each frequency range correspondence
With
Calculate the subband CQI set of each frequency range.
In the present embodiment, a frequency range comprises at least one subband, and the subband CQI of frequency range set comprises the CQI of all subbands on this frequency range, promptly in a frequency range, calculating a CQI at subband, the CQI of all subbands is gathered, is the subband CQI set of this frequency range.When calculating the CQI of a subband, tentation data transmits (for example, n subband arranged in the frequency range, have P to take advantage of n subband in the so whole bandwidth, data are only transmitted) in 1/Pn in this subband scope.The pre-coding matrix of this subband is
Wherein
Be the broadband code book and the subband code book of the frequency range correspondence under this subband,
It is the matrix function of describing mapping relations.Similar aforesaid method just can calculate a subband CQI.CQI represents Signal to Interference plus Noise Ratio, just available signal power is divided by interfering signal power plus noise power, though pre-coding matrix is the same in a frequency range, but because the decline difference of fading characteristic in each subband of wireless channel, thereby and the different CQI differences that cause of the intensity of useful signal.
At last, terminal will report to network side at the broadband CQI of whole each system bandwidth and the subband CQI set of each frequency range.Owing to all chosen corresponding at each frequency range
With
Therefore, the broadband CQI of each system bandwidth and the subband CQI of each frequency range set, the CQI that calculates under the current mechanism is also more accurate, thereby makes network side can further accurately control the network environment of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a method of feeding back the pre-coding matrix indication is applied to multicarrier system, and the system bandwidth of described multicarrier system is divided at least two frequency ranges, and each frequency range comprises some subbands, it is characterized in that, comprising:
Terminal is obtained default frequency range and is divided relevant information, to determine intrasystem frequency range number;
Terminal is chosen corresponding broadband code book at each frequency range respectively;
Terminal is chosen corresponding subband code book based on the broadband code book of each frequency range respectively;
Terminal is with the broadband code book and the subband code book of each frequency range correspondence, and indication reports to network side as pre-coding matrix.
2. the method for claim 1 is characterized in that, described frequency band division relevant information is notified described terminal by the base station by high-level signaling or physical layer signaling, perhaps, notifies described terminal by broadcast mode by the base station in cell range.
3. method as claimed in claim 1 or 2 is characterized in that, described terminal pins is chosen corresponding broadband code book to a certain frequency range, comprising:
Determine corresponding order indication according to pilot frequency information;
Determine should order indicating the code book set that is provided with according to described order indication;
In the set of described code book, filter out and meet the first pre-conditioned code book, as the broadband code book of described a certain frequency range.
4. method as claimed in claim 3 is characterized in that, described first pre-conditionedly is: choose based on the maximization transinformation content, choose based on maximization output Signal to Interference plus Noise Ratio, perhaps, choose based on maximize throughput.
5. method as claimed in claim 3 is characterized in that, described terminal is chosen corresponding subband code book based on the broadband code book of a certain frequency range, comprising:
Determine the matrix function relation of appointment;
Based on the broadband code book of described matrix function relation and described a certain frequency range, in described code book set, filter out and meet the second pre-conditioned code book, as the subband code book of described a certain frequency range.
6. method as claimed in claim 5 is characterized in that, described second pre-conditionedly is: choose based on maximize throughput.
7. as each described method among claim 1-2, the 4-6, it is characterized in that described terminal is chosen corresponding broadband code book at each frequency range respectively, and after choosing corresponding subband code book based on the broadband code book of each frequency range respectively, comprising:
According to the broadband code book and the subband code book of each frequency range correspondence, calculate the broad-band channel quality information that obtains at system bandwidth;
According to the broadband code book and the subband code book of each frequency range correspondence, calculate the sub-band channel quality information set that obtains at each frequency range respectively;
The sub-band channel quality information set of described broad-band channel quality information and each frequency range is reported to network side.
8. a device that feeds back the pre-coding matrix indication is applied to multicarrier system, and the system bandwidth of described multicarrier system is divided at least two frequency ranges, and each frequency range comprises some subbands, it is characterized in that, comprising:
Determining unit is used to obtain default frequency range and divides relevant information, to determine intrasystem frequency range number;
First chooses the unit, is used for choosing corresponding broadband code book at each frequency range respectively;
Second chooses the unit, is used for choosing corresponding subband code book based on the broadband code book of each frequency range respectively;
Report the unit, be used for broadband code book and subband code book with each frequency range correspondence, indication reports to network side as pre-coding matrix.
9. device as claimed in claim 8, it is characterized in that, described first chooses the unit when choosing corresponding broadband code book at a certain frequency range, determine corresponding order indication according to pilot frequency information, determine should order indicating the code book set that is provided with according to described order indication again, and in the set of described code book, filter out and meet the first pre-conditioned code book, as the broadband code book of described a certain frequency range.
10. device as claimed in claim 8, it is characterized in that, described second chooses the unit when choosing corresponding subband code book based on the broadband code book of a certain frequency range, determine the matrix function relation of appointment, again based on the broadband code book of described matrix function relation and described a certain frequency range, and in the set of described code book, filter out and meet the second pre-conditioned code book, as the subband code book of described a certain frequency range.
11. as claim 8,9 or 10 described methods, it is characterized in that, further comprise:
Computing unit, be used for choosing the unit and choose corresponding broadband code book at each frequency range respectively described first, and described second choose the unit and choose corresponding subband code book based on the broadband code book of each frequency range respectively after, broadband code book and subband code book according to each frequency range correspondence, calculate the broad-band channel quality information that obtains at system bandwidth, and respectively according to the broadband code book and the subband code book of each frequency range correspondence, calculate the sub-band channel quality information set that obtains at each frequency range, and the sub-band channel quality information set of described broad-band channel quality information and each frequency range is reported to network side by the described unit that reports.
12. a system of feeding back the pre-coding matrix indication, this system is a multicarrier system, and its system bandwidth is divided at least two frequency ranges, and each frequency range comprises some subbands, it is characterized in that, comprises base station and terminal, wherein,
Terminal, be used to obtain default frequency range and divide relevant information, to determine intrasystem frequency range number, and choose corresponding broadband code book at each frequency range respectively, choose corresponding subband code book based on the broadband code book of each frequency range respectively again, and with the broadband code book and the subband code book of each frequency range correspondence, indication reports to network side as pre-coding matrix;
The base station is used for receiving terminal and reports the pre-coding matrix indication.
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