CN102291222B - 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, multiple data symbols can send on different subcarriers simultaneously, and the frequency interval of subcarrier can guarantee the orthogonality between multiple data symbols just.OFDM modulator is by going here and there and changing the data symbol stream that the data symbol stream of input is converted to multidiameter delay.The output of going here and there and change can be considered as frequency domain data symbol.The subcarrier of bandwidth both sides is not used in transfer of data, is called protection bandwidth.Data symbol on some subcarriers within the scope of data bandwidth can be set as the symbol that receiving terminal is known, and the symbol on these subcarriers is just called frequency pilot sign.Receiving terminal can utilize these frequency pilot signs to estimate channel status, thereby realizes coherent demodulation.
OFDM (Orthogonal Frequency Division Multiple Access, OFDMA) technology is a kind of multicast technology based on OFDM technology.Frequency resource in system bandwidth is divided into a certain size Resource Block, and each Resource Block is the least resource unit that in frequency domain, resource is distributed.OFDMA system to the different resource piece within the scope of system bandwidth, realizes the orthogonal transmission between user by different terminal schedulings.
Under 3GPP standard, LTE system descending adopts OFDMA technology, and the minimum particle size of the resource of each subframe (1ms) in time domain is OFDM symbol, has 12 or 14 OFDM symbols in each subframe.Minimum particle size on frequency domain is subcarrier.Minimum time-frequency unit definition is a basic resources unit (resource element, RE).The minimum resource allocation unit of LTE system definition is Physical Resource Block (Physical Resource Block, PRB), comprises 12 continuous RE that subcarrier is corresponding on the interior all OFDM symbols of a subframe.Terminal may be scheduled on continuous or discontinuous Physical Resource Block.
In LTE Rel-8 standard, LTE system has been introduced closed loop precoding technique to improve spectrum efficiency.First closed loop precoding requires the set of all preserving same pre-coding matrix in base station and terminal, is called code book.Terminal estimates after channel condition information according to cell common pilots, selects a pre-coding matrix by certain criterion from code book.The criterion of choosing can be to choose, choose etc. based on maximizing output Signal to Interference plus Noise Ratio based on maximizing mutual information amount.By the pre-coding matrix of selecting, the index in code book feeds back to base station by up channel to terminal, and this index is designated as pre-coding matrix indication (Precoding MatrixIndicator, PMI).The pre-coding matrix that should use this terminal just can be determined after by the PMI receiving in base station, and 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 matches, and this pre-coding matrix that just means terminal to report should adapt to the channel variation within the scope of transmission bandwidth.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 arrives which subband in whole bandwidth range, can carry out preliminary treatment to data with the pre-coding matrix of terminal to report.For frequency-selective channel, terminal should report multiple pre-coding matrixes, and a part of frequency band in each pre-coding matrix correspondence system bandwidth range, is called subband.When downlink data transmission, if terminal is scheduled on a certain subband, should carry out preliminary treatment to data with pre-coding matrix corresponding to this subband.
The frequency domain granularity of terminal feedback refers to the frequency domain scope that the pre-coding matrix of feedback is corresponding, corresponding pre-coding matrix calculates according to the channel condition information within the scope of this frequency domain, and the data of the transmission within the scope of this frequency domain 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 whole system bandwidth, be called broadband feedback, the channel condition information of its feedback is called wide-band-message; If the frequency domain granularity of feedback is a subband, be called subband feedback, the channel condition information of its feedback is called sub-band information.
In order to meet the high-precision requirement of MIMO to channel condition information, the feedback quantity of increase channel information within reason has simultaneously proposed the scheme that a kind of multi-granule feeds back in the formulation process of LTE Rel-10 standard.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
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
be used for describing broadband character when long, corresponding to the high relevant portion of channel, with larger frequency domain granularity feedback
also can not bring obvious performance loss, therefore its feedback granularity is generally whole system bandwidth.
for describing the narrow-band characteristic in short-term of channel, corresponding to the low relevant portion of channel, should be with less frequency domain granularity feedback, its feedback granularity is subband; Feed back each
required bit number can be less, and therefore on the whole, the scheme of multi-granule feedback can reduce feedback quantity.
In multi-granule feedback scheme, the final pre-coding matrix of each subband 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 applying on several continuous subbands
but be identical,
identical depending in much scopes
granularity, for example, if
granularity be system bandwidth, the wide-band-message of applying on each subband in whole system bandwidth range is identical.The effective precondition of multi-granule feedback scheme is,
in whole system bandwidth range, be all effective.Under desirable condition,
really be in whole bandwidth range, to be all effective.
But, in actual system, between the radio-frequency transmissions circuit transfer function of any two antennas of base station, all can there is certain difference, specifically, all difference to some extent of time delay and amplitude.Shi Yanhui causes the phase rotating in frequency domain.If system bandwidth large (as, system bandwidth is 20MHz), in these frequency domains that cause due to different delay between antenna, phase rotating can make any one pre-coding matrix in code book all cannot be applicable to whole system bandwidth so.For example, if 8-DFT (DFT, Discrete FourierTransform) vector for code book, the phase difference between two adjacent vectors is π/4, and the bandwidth range that can apply so same precoding vector is
(the delay inequality maximum between the antenna of LTE system regulation can not exceed for 65 nanoseconds), be about 2MHz bandwidth; Even if consider that deviation may can not bring too large performance loss to adjacent pre-coding matrix yet, bandwidth range also far can not reach system bandwidth 20MHz.In this case, if only feed back broadband
will inevitably cause on some subbands
do not mate with the channel status of this subband, thereby the pre-coding matrix finally obtaining does not mate with the channel status of subband, like this, just make base station cannot 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 present invention provides a kind of method, Apparatus and system of feeding back precoding matrix indication, the accuracy of indicating in order to improve the pre-coding matrix of end side feedback.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A method for feeding back precoding 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 the 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 for each frequency range respectively;
The terminal respectively broadband code book based on each frequency range is chosen corresponding subband code book;
Terminal is by broadband code book corresponding each frequency range and subband code book, and as pre-coding matrix, indication reports to network side.
A device for feeding back precoding 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, divides relevant information for obtaining default frequency range, to determine intrasystem frequency range number;
First chooses unit, for choosing corresponding broadband code book for each frequency range respectively;
Second chooses unit, chooses corresponding subband code book for the broadband code book based on each frequency range respectively;
Report unit, for by broadband code book corresponding each frequency range and subband code book, indicate and report to network side as pre-coding matrix.
A system for feeding back precoding matrix indication, this system is 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, divide relevant information for obtaining default frequency range, to determine intrasystem frequency range number, and choose corresponding broadband code book for each frequency range respectively, broadband code book based on each frequency range is chosen corresponding subband code book respectively again, and by broadband code book corresponding each frequency range and subband code book, as pre-coding matrix, indication reports to network side;
Base station, reports pre-coding matrix indication for receiving terminal.
The PMI feedback that the embodiment of the present invention is multi-granule provides and reports mechanism a kind of aperiodic, different from existing mechanism, in the embodiment of the present invention, system bandwidth is divided into some frequency ranges, broadband code book of each frequency range feedback and a son band code book are as PMI, like this, compare under current mechanism at PMI of whole system bandwidth internal feedback, greatly improve the accuracy of the PMI of feedback, make network side can accurately know according to the PMI of terminal to report the network environment of each frequency range in system bandwidth, thereby can select exactly the pre-coding matrix adapting, and then effectively improve precoding gain.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention Mid Frequency dividing mode schematic diagram;
Fig. 2 A is LTE Solution Architecture schematic diagram in the embodiment of the present invention;
Fig. 2 B is termination function structural representation in the embodiment of the present invention;
Fig. 3 is terminal to report PMI flow chart in the embodiment of the present invention.
Embodiment
The accuracy of indicating in order to improve the pre-coding matrix for system bandwidth of end side feedback, in the embodiment of the present invention, the whole bandwidth of system is divided into several frequency ranges, specifically as shown in Figure 1, in a frequency range, can include multiple subbands, subband size is relevant with system bandwidth to be defined in existing standard, and frequency range is the concept of new definition in the embodiment of the present invention here.Terminal is that each frequency range reports a broadband (or long time) information
the granularity that is wide-band-message feedback is a frequency range, meanwhile, and for each frequency range reports an arrowband (or in short-term) information
the granularity that is narrow band information feedback is also a frequency range.
In the substandard LTERel-8/Rel-9 version of 3GPP, stipulate, base station can adopt ascending control channel (Physical Uplink Control Channel by high-level signaling configurating terminal, PUCCH) carry out reporting the aperiodic that the periodicity of channel condition information reports and/or adopt Uplink Shared Channel (Physical Uplink SharedChannel, PUSCH) to carry out channel condition information.Reporting source of channel state information mode based on PUSCH channel in Rel-8 and Rel-9 version cannot complete the wide-band-message of multiple frequency ranges and reporting of sub-band information, in view of this, in the present embodiment, provide and a kind ofly can complete the wide-band-message of multiple frequency ranges and the reporting source of channel state information mode based on PUSCH that sub-band information reports.
Table 1
| Content | Size | Granularity | Number | Total bits (RI＜＝2) | Total bits (RI＞2) |
| RI | 3 | S | 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 | S | 1 | 4 | 4 |
| Wideband CQI for codeword2 | 4 | S | 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 LTE system, in order to improve the accuracy of CSI of feedback, adopted two independently code book feed back respectively PMI, corresponding (or broadband) characteristic of channel when long and another correspondence (or arrowband) characteristic of channel in short-term.Consult shown in table 1, the code book of characteristic of channel when W1 represents corresponding length, W2 represents the corresponding code book of the characteristic of channel in short-term.When corresponding long, the code book W1 of the characteristic of channel is made up of DFT vector substantially, and each DFT vector is representing 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 associated antenna scene, especially, under relevant dual polarized antenna configuration, Rank <=2 are transmitted as master; And Rank > 2 transmission opportunitys will improve under uncorrelated antenna scene, when long under uncorrelated antenna configuration so, the characteristic of channel has just lost meaning because can not form in this case the wave beam of a specific direction, therefore, as shown in table 1, when Rank > 2, W1 has not just fed back, has only fed back W2.
Consult shown in Fig. 1, S represents all subband set, namely equals system bandwidth; BS (BandSegment) represents frequency range, comprises some subbands, can be regarded as the subband set that is less than system bandwidth, in a system bandwidth, can mark off multiple BS.RI represents rank (order) indication, so because LTE-A system supports that at most 8 flow transmission need to represent with 3 bits, one of full bandwidth feedback.When long, code book W1 represents with 4 bits, and its code book is made up of 16 elements, and each BS (frequency range) feeds back one, and whole system bandwidth is divided into 4 frequency ranges, so o'clock need to feed back altogether 16 bits in RI <=2.In RI <=2 o'clock, code book W2 represents with 2 bits in short-term, and its code book is made up of 4 elements.In the time of RI > 2, when long, code book W1 has not just fed back or has fixed one (unit matrix), and code book W2 represents with 4 bits in short-term, and its code book is made up of 16 elements.W2 is one of a BS internal feedback, and whole like this bandwidth internal feedback 4 so, o'clock needs altogether 8 bits in rank <=2, and needs altogether 16 bits when rank > 2.4 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.In the situation that 2 space code words all need feedback of channel information, the bit number of feedback is 91 and 83 bits respectively in the time of rank <=2 and rank > 2 altogether.In the situation that only having 1 space code word to need feedback of channel information, the bit number of feedback is 59 and 51 bits respectively in the time of rank <=2 and rank > 2 altogether.The in the situation that of rank=1, altogether needing number of bits of feedback 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 present invention, for the system of feeding back channel state information (as, LTE system) comprise some base stations and some terminals, this system is multicarrier system, its system bandwidth is divided at least two frequency ranges, each frequency range comprises some subbands, wherein
Terminal, divide relevant information for obtaining default frequency range, to determine intrasystem frequency range number, described frequency range comprises at least one subband, and choose corresponding broadband code book for each frequency range respectively, broadband code book based on each frequency range is chosen corresponding subband code book respectively again, and by broadband code book corresponding each frequency range and subband code book, as PMI, indication reports to network side;
Base station, the PMI reporting for receiving terminal.
Consult shown in Fig. 2 B, in the embodiment of the present invention, for the device of feeding back channel state information (as, UE) comprise that determining unit 20, first chooses unit 21, second and choose unit 22 and report unit 23, this application of installation is in 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, divides relevant information for obtaining default frequency range, and to determine intrasystem frequency range number, described frequency range comprises at least one subband;
First chooses unit 21, for choosing corresponding broadband code book for each frequency range respectively;
Second chooses unit 22, chooses corresponding subband code book for the broadband code book based on each frequency range respectively;
Report unit, for by broadband code book corresponding each frequency range and subband code book, report to network side as PMI.
As shown in Figure 2 B, UE further comprises a computing unit 24, choose corresponding broadband code book for each frequency range respectively for choosing unit 21 first, and second choose unit 22 respectively the broadband code book based on each frequency range choose after corresponding subband code book, according to broadband code book corresponding to each frequency range and subband code book, calculate the broad-band channel quality information obtaining for system bandwidth, and respectively according to broadband code book corresponding to each frequency range and subband code book, calculate the sub-band channel quality information set obtaining for 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 said system framework, in the embodiment of the present invention, take LTE system as example, corresponding aperiodic channel status information (Channel State Information, CSI) feedback is triggered by " CQI request " bit in descending control information format 0 (DCI format 0) in base station.Specific practice is, DCI format 0 is arrived in UE blind check in subframe n, and check " CQI request " bit status in DCI format 0, if state is " needing CSI feedback ", will in subframe n+k, feed back CSI aperiodic, comprise channel quality information (CQI)/pre-coding matrix indication (PMI)/order indication (RI).Concrete CQI, PMI and the modulation of RI, coding, resource mapping are all identical with Rel-8.In the present embodiment, the mode that reports of CQI and PMI has been made to relevant optimization, consulted shown in Fig. 3, terminal (being UE) is as follows to the detailed process of base station side feedback PMI:
Step 300: terminal is obtained for the default frequency range of system bandwidth and 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, by base station by high-level signaling or physical layer signaling notification terminal, also can be passed through by base station broadcast mode notification terminal in cell range.
Step 310: terminal is chosen corresponding broadband code book for each frequency range respectively,
In the embodiment of the present invention,
it is a best code book of selecting by certain criterion from a group code basis in a frequency range, the criterion of choosing can set in advance, for example, choose, choose, choose etc. based on maximize throughput based on maximizing output Signal to Interference plus Noise Ratio based on maximizing transinformation content, by the pre-coding matrix of selecting, the index in code book feeds back to base station by up channel to terminal, this index is designated as PMI, for example, and the above-mentioned corresponding broadband of the each frequency range code book selecting
just can be regarded as PMI, owing to there being P frequency range, therefore altogether will select P
To choose broadband code book based on maximize throughput as example, choosing in certain frequency range
time, tentation data only transmits in 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 according to RI the optional codebook set arranging should RI again, the span of RI is [1,8], can represent with 3 bits, the value difference of RI, its corresponding codebook set is also different, then, terminal is calculated throughput corresponding to all code books that selected codebook set comprises in above-mentioned frequency range, and selects a code book conduct of throughput maximum
Step 320: terminal based on broadband code book corresponding to each frequency range, is chosen corresponding subband code book, respectively
In the present embodiment, choosing in certain frequency range
time, in tentation data, only in this frequency range, transmit, and the broadband code book of applying in this frequency range is to calculate for this frequency range in step 310
wherein, in certain frequency range, choosing
situation under select corresponding
existing
hypothesis under carry out and also be one of a Frequency Band Selection, therefore, in whole system bandwidth, also can select P
selecting certain frequency range
after, terminal will be determined the matrix function relation of appointment, in the present embodiment, the matrix function relation of appointment is
terminal will be selected based on this matrix function relation with
choose corresponding according to certain criterion
suppose based on criterion be to choose based on maximum throughput, so, terminal will chosen
time use codebook set in, calculate each code book with
carry out the throughput obtaining after computing, and using a code book of throughput maximum wherein as choosing
due to final precoding vector (matrix) be by
with
common formation, therefore, certain frequency range selecting in the manner described above
with
can guaranteed performance the best.
For example, as shown in table 1, W1 and W2 respectively corresponding correspondence are above above-mentioned
with
with
respectively from different code book C
1and C
2in choose, namely refer to PMI.
Step 330: terminal, by broadband code book corresponding each frequency range and subband code book, reports to network side as PMI.
The PMI feedback that the embodiment of the present invention is multi-granule provides report mechanism a kind of aperiodic, and different from 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 current mechanism at PMI of whole system bandwidth internal feedback, greatly improve the accuracy of the PMI of feedback, make network side can accurately know according to the PMI of terminal to report the network environment of each frequency range in system bandwidth, thereby can select exactly the pre-coding matrix adapting, and then effectively improve precoding gain.
Based on above-described embodiment, terminal is being chosen for each frequency range respectively accordingly
with
after, can further calculate the broadband CQI obtaining for system bandwidth, and gather for the subband CQI of each frequency range, be specially:
First, terminal is corresponding based on each frequency range respectively
with
calculate the broadband CQI for system bandwidth.
In the time calculating broadband CQI, tentation data transmits in whole bandwidth, and in each frequency range, adopts respectively pre-coding matrix corresponding to this frequency range
wherein
for broadband code book corresponding to this frequency range and subband code book,
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 signal energy, and I is interfering energy, σ
2for noise energy, in practical application, also can use signal to noise ratio (SNR) to replace SINR.
(2) SINR of N subcarrier is fitted to CQI.
Subband size is generally m PRB, and m < M (M is the PRB sum in system bandwidth) is a kind of example of CQI computational methods above, here a PRB is that a Resource Block unit comprises some subcarriers, and a subband comprises some PRB.Similar method as above is calculated after the corresponding frequency range CQI of each frequency range, asks its mean value, and this mean value is the broadband CQI for whole system bandwidth.
Secondly, terminal is corresponding based on each frequency range respectively
with
calculate the subband CQI set of each frequency range.
In the present embodiment, a frequency range comprises at least one subband, and the CQI of all subbands in this frequency range of subband CQI set-inclusion of a frequency range, in a frequency range, calculating a CQI for a subband, the CQI of all subbands is gathered, is the subband CQI set of this frequency range.In the time calculating the CQI of a subband, tentation data transmits (for example, have n subband in a frequency range, have P to take advantage of n subband in so whole bandwidth, data are only transmitted in 1/Pn) within the scope of this subband.The pre-coding matrix of this subband is
wherein
for broadband code book corresponding to the frequency range under this subband and subband code book,
it is the matrix function of describing mapping relations.Similar method as above just can calculate a subband CQI.CQI represents Signal to Interference plus Noise Ratio, namely available signal power is divided by interfering signal power plus noise power, although pre-coding matrix is the same in a frequency range, but because the decline difference of the fading characteristic of wireless channel in each subband, thereby and the different CQI differences that cause of the intensity of useful signal.
Finally, the subband CQI set of the broadband CQI for whole each system bandwidth and each frequency range is reported to network side by terminal.Corresponding owing to all having chosen for each frequency range
with
therefore, the broadband CQI of each system bandwidth and the subband CQI of each frequency range set, also more accurate compared to the CQI calculating under current mechanism, thus make network side can further accurately control the network environment of system.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (6)
1. a method for feeding back precoding 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 for each frequency range respectively, is specially: determine corresponding order indication according to pilot frequency information; Determine should order indicating the codebook set arranging according to described order indication; In described codebook set, filter out and meet the first pre-conditioned code book, as the broadband code book of described a certain frequency range; Described first is pre-conditionedly: choose based on maximizing transinformation content, choose based on maximizing output Signal to Interference plus Noise Ratio, or, choose based on maximize throughput;
The terminal respectively broadband code book based on each frequency range is chosen corresponding subband code book, is specially: determine the matrix function relation of specifying; Broadband code book based on described matrix function relation and described a certain frequency range filters out and meets the second pre-conditioned code book, as the subband code book of described a certain frequency range in described codebook set; Described second is pre-conditionedly: choose based on maximize throughput;
Terminal is by broadband code book corresponding each frequency range and subband code book, and as pre-coding matrix, indication reports to network side.
2. the method for claim 1, is characterized in that, described frequency range is divided relevant information and notified described terminal by base station by high-level signaling or physical layer signaling, or, in cell range, notify described terminal by broadcast mode by base station.
3. the method as described in any one in claim 1-2, is characterized in that, described terminal is chosen corresponding broadband code book for each frequency range respectively, and the broadband code book based on each frequency range is chosen after corresponding subband code book respectively, comprising:
According to broadband code book corresponding to each frequency range and subband code book, calculate the broad-band channel quality information obtaining for system bandwidth, be specially: the Signal to Interference plus Noise Ratio that calculates each subcarrier, the Signal to Interference plus Noise Ratio of N subcarrier is fitted to channel quality information, described N is all pilot sub-carriers in system bandwidth, calculate after the corresponding frequency range channel quality information of each frequency range, ask its mean value, this mean value is the broad-band channel quality information for whole system bandwidth;
According to broadband code book corresponding to each frequency range and subband code book, calculate the sub-band channel quality information set obtaining for 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.
4. a device for feeding back precoding 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, divides relevant information for obtaining default frequency range, to determine intrasystem frequency range number;
First chooses unit, for choosing corresponding broadband code book for each frequency range respectively, be specially: determine corresponding order indication according to pilot frequency information, determine should order indicating the codebook set arranging according to described order indication again, and in described codebook set, filter out and meet the first pre-conditioned code book, as the broadband code book of described a certain frequency range; Described first is pre-conditionedly: choose based on maximizing transinformation content, choose based on maximizing output Signal to Interference plus Noise Ratio, or, choose based on maximize throughput;
Second chooses unit, be used for the broadband code book based on each frequency range respectively and choose corresponding subband code book, be specially: when the broadband code book based on a certain frequency range is chosen corresponding subband code book, determine the matrix function relation of specifying, broadband code book based on described matrix function relation and described a certain frequency range again, and in described codebook set, filter out and meet the second pre-conditioned code book, as the subband code book of described a certain frequency range; Described second is pre-conditionedly: choose based on maximize throughput;
Report unit, for by broadband code book corresponding each frequency range and subband code book, indicate and report to network side as pre-coding matrix.
5. device as claimed in claim 4, is characterized in that, further comprises:
Computing unit, choose corresponding broadband code book for each frequency range respectively for choosing unit described first, and described second choose unit respectively the broadband code book based on each frequency range choose after corresponding subband code book, according to broadband code book corresponding to each frequency range and subband code book, calculate the broad-band channel quality information obtaining for system bandwidth, and respectively according to broadband code book corresponding to each frequency range and subband code book, calculate the sub-band channel quality information set obtaining for each frequency range, and by the described unit that reports, the sub-band channel quality information set of described broad-band channel quality information and each frequency range is reported to network side, wherein, described computing unit calculates acquisition: the Signal to Interference plus Noise Ratio that calculates each subcarrier, the Signal to Interference plus Noise Ratio of N subcarrier is fitted to channel quality information, described N is all pilot sub-carriers in system bandwidth, calculate after the corresponding frequency range channel quality information of each frequency range, ask its mean value, this mean value is the broad-band channel quality information for whole system bandwidth.
6. a system for feeding back precoding matrix indication, this system is 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, divide relevant information for obtaining default frequency range, to determine intrasystem frequency range number, and choose corresponding broadband code book for each frequency range respectively, broadband code book based on each frequency range is chosen corresponding subband code book respectively again, and by broadband code book corresponding each frequency range and subband code book, as pre-coding matrix, indication reports to network side; Wherein, the detailed process that described terminal pins is chosen corresponding broadband code book to a certain frequency range is: determine corresponding order indication according to pilot frequency information, determine should order indicating the codebook set arranging according to described order indication, in described codebook set, filter out and meet the first pre-conditioned code book, as the broadband code book of described a certain frequency range, described first is pre-conditionedly: choose based on maximizing transinformation content, choose based on maximizing output Signal to Interference plus Noise Ratio, or, choose based on maximize throughput; The detailed process that the broadband code book of described terminal based on a certain frequency range chosen corresponding subband code book is: determine the matrix function relation of specifying, broadband code book based on described matrix function relation and described a certain frequency range, in described codebook set, filter out and meet the second pre-conditioned code book, as the subband code book of described a certain frequency range, described second is pre-conditionedly: choose based on maximize throughput;
Base station, reports pre-coding matrix indication for receiving terminal.
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| RU2676268C1 (en) * | 2015-09-04 | 2018-12-27 | Телефонактиеболагет Лм Эрикссон (Пабл) | Preliminary coding for transmission from single-dimensional antenna array, which includes co-polarized antenna elements aligned on single line in single spatial dimension |
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| WO2019095309A1 (en) * | 2017-11-17 | 2019-05-23 | 华为技术有限公司 | Channel state information feedback method, communication device, and system |
| CN109690962A (en) * | 2017-12-27 | 2019-04-26 | Oppo广东移动通信有限公司 | Method, terminal device and the network equipment of data precoding |
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