CN105577328A - Channel state information feedback method and terminal - Google Patents
Channel state information feedback method and terminal Download PDFInfo
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- CN105577328A CN105577328A CN201410528578.4A CN201410528578A CN105577328A CN 105577328 A CN105577328 A CN 105577328A CN 201410528578 A CN201410528578 A CN 201410528578A CN 105577328 A CN105577328 A CN 105577328A
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Abstract
The invention discloses a channel state information feedback method and a terminal in order to avoid the problem that the feedback overhead is large and the computation is complex for the existing scheme in which the channel state information of each CSI process is fed back separately and to reduce the feedback overhead and the computation complexity. The method comprises the following steps: a terminal acquires channel matrixes corresponding to more than two channel state information reference signal CSI-RS resources; the terminal determines an intermediate parameter according to each channel matrix, and determines one or two groups of channel state information according to the intermediate parameter, wherein each group of channel state information includes a rank indicator, a pre-coding matrix indicator and a channel quality indicator; and the terminal sends the one or two groups of channel state information to a base station.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of channel state information feedback method and terminal.
Background technology
Closed loop precoding technique is introduced to improve frequency efficiency in Long Term Evolution (LTE) Rel-8 system.Closed loop precoding requires the set of preserving same pre-coding matrix in base station and terminal respectively, is called code book.After terminal estimates channel information according to cell common pilots, from code book, select a pre-coding matrix by certain criterion.Criterion of Selecting can be maximize mutual information, maximization output Signal to Interference plus Noise Ratio etc.The pre-coding matrix selected index is in the codebook fed back to base station by up channel by terminal, and this index is designated as pre-coding matrix instruction (PrecodingMatrixIndicator, PMI).The pre-coding matrix that terminal uses, according to the search index code book received, is determined in base station.The index of the pre-coding matrix of terminal to report can be regarded as the quantized value of channel condition information.
Except PMI, terminal also can report rank indication information (RankIndicator, RI) and channel quality information (ChannelQualityIndicator, CQI).Wherein, RI corresponds to the independent data flow amount of spatial multiplexing transmission, and the spatial data flow amount that the space channel namely from base station to terminal can be supported at most is indicated by RI.CQI for balancing the channel quality from base station to terminal, as the foundation that modulation system and code rate are selected.In LTE and LTE-A standard, base station is called a code word to terminal transmission data block, and in case of spatial multiplexing, a code word simultaneously to terminal transmission two code words, also only can be transmitted at most in base station.The data of a code word are mapped in one or more spatial data according to certain rule.If the transmission of two code words, then the number of this data flow total that two code words map should not exceed the number of the data flow that base station can be supported at most to the space channel of terminal, and the number of this data flow can supported at most is obtained by the RI of terminal to report.If space channel can support the transmission of multiple data flow, i.e. RI>1, then represent the transmission that be transmitted as two code words of base station to terminal, terminal calculates the CQI of two code words respectively and feeds back to base station.
Can configure maximum 3 channel state information reference signals (CSI-RS) resources for a terminal in LTERel-10 system, the port number of each CSI-RS can be 1,2,4,8; Terminal can have at most 3 CSI processes to feed back corresponding channel condition information respectively.Such as, suppose that a CSI-RS is 8 ports, 3 CSI-RS one have 24 CSI-RS ports, and terminal is carried out respectively measuring and generated 3 cover channel condition informations and feeds back to base station respectively in each CSI-RS.
In three-dimensional multiple-input and multiple-output (3DMIMO) system, base station transmit antennas data may be very many, and CSI-RS port number also may be a lot, and wherein a kind of collocation method is the multiple CSI-RS of configuration.Such as, antenna for base station number be as illustrated in figs. ia and ib 64 (be vertically 8, level be 8), base station configures 8 CSI-RS and is 8 ports, corresponding vertical dimension 8 antennas of 8 port CSI-RS or horizontal dimension 8 antennas, terminal can detect 88 port CSI-RS.If be terminal configuration 8 CSI processes according to the method for Rel-10, the channel condition information that terminal is corresponding to each CSI progress feedback respectively, terminal needs feedback 8 to overlap CSI information altogether, often overlaps CSI information and comprises RI, PMI and CQI.
In prior art, terminal feeds back the channel condition information of each CSI process respectively, and the feedback overhead taken in the system that antenna data is large is very large, and base station implementation complexity is high.Connect example, feedback 8 cover CSI information, increases the feedback overhead of 7 times compared to a set of CSI information of feedback, and, base station, after CSI information is overlapped in reception 8, needs to calculate transmission signal corresponding RI, PMI and CQI, obtains the process sending RI, PMI and CQI of signal accurately complicated.
Summary of the invention
The embodiment of the present invention provides a kind of channel state information feedback method and terminal, and the feedback overhead caused in order to avoid the channel condition information feeding back each CSI process in existing scheme is respectively large, the problem of calculation of complex, reduces feedback overhead and computation complexity.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
First aspect, provides a kind of channel state information feedback method, comprising:
Terminal obtains each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
Described terminal, according to each described channel matrix determination intermediate parameters, determines one group or two groups of channel condition informations according to described intermediate parameters, often organizes described channel condition information and comprises order, pre-coding matrix instruction and channel quality information;
Described one group or two groups of channel condition informations are sent to base station by described terminal.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
The mean value that described terminal calculates all described channel matrixes obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described plural CSI-RS is divided into two groups by described terminal, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining channel condition information described in two groups according to often organizing each self-corresponding described equivalent channel matrix of CSI-RS.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
The mean value that described terminal calculates all described channel matrixes obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described plural CSI-RS is divided into two groups by described terminal, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtains and often organizes each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
Described terminal is respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
Preferably, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described terminal, respectively according to each described channel matrix, calculates the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups by described terminal;
Described terminal is respectively for often organizing CSI-RS, and each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Described terminal calculates one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
Preferably, describedly select a CSI-RS according to each described special parameter and preset rules, comprising:
Described terminal determines the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Described terminal determines the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, described method also comprises:
The mark of the described CSI-RS selected is sent to described base station by described terminal.
Second aspect, provides a kind of terminal, comprising:
Acquisition module, for obtaining each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
Determination module, for each described channel matrix determination intermediate parameters obtained according to described acquisition module, determine one group or two groups of channel condition informations according to described intermediate parameters, often organize described channel condition information and comprise order, pre-coding matrix instruction and channel quality information;
Sending module, sends to base station for described a group or the two groups of channel condition informations determined by described determination module.
Preferably, described determination module specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
Preferably, described determination module specifically for:
Described plural CSI-RS is divided into two groups, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining channel condition information described in two groups according to often organizing each self-corresponding described equivalent channel matrix of CSI-RS.
Preferably, described determination module specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
Preferably, described determination module specifically for:
Described plural CSI-RS is divided into two groups, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtain and often organize each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
Preferably, described determination module specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
Preferably, described determination module specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups;
Respectively for often organizing CSI-RS, each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Calculate one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
Preferably, described determination module specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, described sending module also for:
The mark of the described CSI-RS selected is sent to described base station.
Based on technique scheme, in the embodiment of the present invention, terminal is after each self-corresponding channel matrix of the multiple CSI-RS of acquisition, according to each channel matrix determination intermediate parameters, determine one group or two groups of channel condition informations according to this intermediate parameters, this group that determines or two groups of channel condition informations are sent to base station, thus when there being multiple CSI process, only need feedback one group or two groups of channel condition informations to base station, reduce feedback overhead, and reduce the computation complexity of base station.
Accompanying drawing explanation
Fig. 1 a to be antenna for base station number be 64 CSI-RS configuration schematic diagram;
Fig. 1 b to be antenna for base station number be 64 another CSI-RS configuration schematic diagram;
Fig. 2 is the method flow schematic diagram of terminal feedback channel condition information in the embodiment of the present invention;
Fig. 3 is terminal structure schematic diagram in the embodiment of the present invention;
Fig. 4 is another terminal structure schematic diagram in the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, in the embodiment of the present invention, the method detailed flow process of terminal feedback channel condition information is as follows:
Step 201: terminal obtains each self-corresponding channel matrix of plural CSI-RS.
Particularly, the line number of the number of CSI-RS and the antenna of base station side or columns identical.If base station sends measurement pilot frequency from every array antenna, then the number of CSI-RS is identical with the columns of the antenna of base station side; If base station sends measurement pilot frequency from every row antenna, then the number of CSI-RS is identical with the line number of the antenna of base station side.
In concrete enforcement, terminal carries out channel measurement respectively in multiple CSI-RS, obtains each self-corresponding channel matrix of the plurality of CSI-RS.
Such as, base station side is furnished with 2 dimension antennas, and by N, capable and M array antenna is formed this 2 dimension antenna, and General N and M are even numbers, and base station can send measurement pilot frequency separately from often row or every array antenna, generally often row or the pilot frequency port number often on row identical.Suppose that base station sends measurement pilot frequency from every array antenna, send altogether M and overlap measurement pilot frequency, often overlapping pilot tone is one or more ports, correspondingly, terminal measures channel respectively in M CSI-RS, obtains the channel condition information of a set of corresponding M CSI-RS and feeds back to base station.Suppose that base station sends measurement pilot frequency from every row antenna, send altogether N and overlap measurement pilot frequency, often overlapping pilot tone is one or more ports, correspondingly, terminal measures channel respectively in NCSI-RS resource, obtains the channel condition information of the N number of CSI-RS of a set of correspondence and feeds back to base station.
Step 202: terminal, according to each channel matrix determination intermediate parameters obtained, determines one group or two groups of channel condition informations according to this intermediate parameters.
Wherein, often organize channel condition information and comprise order, pre-coding matrix instruction and channel quality information.
Preferably, terminal determination intermediate parameters, determines one group of channel condition information according to this intermediate parameters, includes but not limited to following several execution mode:
The first, the mean value that terminal calculates all channel matrixes obtains equivalent channel matrix, determines one group of channel condition information according to this equivalent channel matrix.Particularly, be averaging after terminal is cumulative by all channel matrixes, obtain equivalent channel matrix.
The second, the mean value that terminal calculates all channel matrixes obtains equivalent channel matrix, calculate according to each channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each order obtains average rank value, calculate according to the equivalent channel matrix obtained and average rank value and obtain pre-coding matrix instruction and channel quality information, by this average rank value, calculate this pre-coding matrix instruction of obtaining and this channel quality information is defined as one group of channel condition information.
Preferably, after calculating the mean value of each order, rounding operation is carried out to this mean value, using the result that obtains after rounding operation as average rank value.Wherein, can be this mean value is rounded up or rounds downwards.
The third, terminal is respectively according to each channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each special parameter and preset rules, calculate one group of channel condition information corresponding to CSI-RS selected as the channel condition information determined.
During the third is specifically implemented, the concrete mode of a CSI-RS is selected to include but not limited to following two kinds:
The first, terminal determines the minimum value in each special parameter, selects a CSI-RS, wherein from the CSI-RS that this minimum value is corresponding, if more than one of the CSI-RS that this minimum value is corresponding, then Stochastic choice one from CSI-RS corresponding to this minimum value.
The second, terminal determines the maximum in each special parameter, selects a CSI-RS, wherein from the CSI-RS that this maximum is corresponding, if more than one of the CSI-RS that this maximum is corresponding, then Stochastic choice one from CSI-RS corresponding to this maximum.
Preferably, during the third is specifically implemented, special parameter can be any one in order or channel quality information.
Preferably, during the third is specifically implemented, the mark of the CSI-RS of selection is sent to base station by terminal.
Preferably, plural CSI-RS is divided into two groups by terminal, determine often to organize CSI-RS intermediate parameters separately according to often organizing each described channel matrix corresponding to CSI-RS, determining often to organize each self-corresponding one group of channel condition information of CSI-RS according to often organizing CSI-RS described intermediate parameters separately, obtaining two groups of channel condition informations.Specific implementation includes but not limited to following several:
The first, plural CSI-RS is divided into two groups by terminal, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining two groups of channel condition informations according to often organizing each self-corresponding equivalent channel matrix of CSI-RS.
The second, described plural CSI-RS is divided into two groups by terminal, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtains and often organizes each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
The third, terminal, respectively according to each described channel matrix, calculates the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups by terminal;
Terminal is respectively for often organizing CSI-RS, and each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Terminal calculates one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
This third concrete to implement, select the mode of a CSI-RS to include but not limited to following two kinds:
The first, terminal determines the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
The second, terminal determines the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, this third concrete to implement, special parameter can be any one in order or channel quality information.
Preferably, this third concrete to implement, the mark of the CSI-RS of selection is sent to base station by terminal.
Step 203: this group that determines or two groups of channel condition informations are sent to base station by terminal.
In concrete enforcement, more than determine that, in the third execution mode in one group of channel condition information and above the third execution mode determined in two groups of channel condition informations, the mode sending the mark of the CSI-RS selected to base station has following two kinds:
The first, the order in the mark of the CSI-RS of selection and channel condition information carries out combined coding, feeds back to base station together with channel condition information.
The second, by the form of definition ascending control channel (PUCCH), the mark of the CSI-RS of selection is fed back to base station separately, and feedback cycle designs separately, can be identical with the feedback cycle of channel condition information, also can be different.
Be illustrated below by way of the detailed process of two specific embodiments to terminal feedback channel condition information.
Two specific embodiments below, the aerial array schematic diagram of 64 ports shown in composition graphs 1a, if 8 row can be divided into according to row division, often row 8 ports; The aerial array schematic diagram of 64 ports shown in composition graphs 1b, if 8 row can be divided into according to row division, often row 8 ports.Base station sends 8 CSI-RS according to Fig. 1 a or Fig. 1 b, and each CSI-RS has 8 ports.
In first specific embodiment, terminal measures channel respectively in 8 CSI-RS, obtains the channel condition information of a set of corresponding 8 CSI-RS and feed back to base station according to any one in mode a-mode f.Specific as follows:
Mode a, terminal carries out channel measurement respectively in 8 CSI-RS, obtains channel matrix H 1 ~ H8, is averaging and obtains equivalent channel H, then calculate RI, PMI, CQI according to equivalent channel H to all channel matrixes.
Mode b, terminal carries out channel measurement respectively in 8 CSI-RS, obtains channel matrix H 1 ~ H8, calculates respectively and obtains each CSI-RS channel condition information separately, be expressed as RI_i, PMI_i, CQI_i (i=1 ~ 8); Therefrom choose maximum rank value RI_i (i=1 ~ 8), if CSI-RS corresponding to maximum rank value has multiple, so Stochastic choice one from each CSI-RS corresponding to maximum rank value.Obtain corresponding RI_i, PMI_i and CQI_i of CSI_RS resource of selecting and feed back.RI, PMI are identical with existing method with CQI feedback method.Alternatively, according to the mark i of the CSI_RS resource of the selection of feedback table 1 Suo Shi.
Table 1
| CSI-RS identifies i | Feedback bits |
| 1 | 000 |
| 2 | 001 |
| 3 | 010 |
| 4 | 011 |
| 5 | 100 |
| 6 | 101 |
| 7 | 110 |
| 8 | 111 |
Mode c, terminal is process channel measurement in 8 CSI-RS respectively, obtains channel matrix H 1 ~ H8, calculates each CSI-RS channel condition information separately respectively, be expressed as RI_i, PMI_i, CQI_i (i=1 ~ 8); Therefrom choose minimum rank value RI_i (i=1 ~ 8), if CSI-RS corresponding to minimum rank value has multiple, so Stochastic choice one from each CSI-RS corresponding to minimum rank value.Obtain corresponding RI_i, PMI_i and CQI_i of CSI_RS resource of selecting and feed back.RI, PMI are identical with existing method with CQI feedback method.Alternatively, according to the mark i of the CSI_RS resource of the selection of feedback table 1 Suo Shi.
Mode d, terminal carries out channel measurement respectively in 8 CSI-RS, obtains channel matrix H 1 ~ H8, calculates respectively and obtains each CSI-RS channel condition information separately, be expressed as RI_i, PMI_i, CQI_i (i=1 ~ 8); Therefrom choose maximum CQI value CQI_i (i=1 ~ 8), if CSI-RS corresponding to maximum CQI value has multiple, so Stochastic choice one from each CSI-RS corresponding to this maximum CQI value.Obtain according to corresponding RI_i, PMI_i and the CQI_i of the CSI-RS chosen and feed back.RI, PMI are identical with existing method with CQI feedback method.Alternatively, according to the mark i of the CSI_RS resource of the selection of feedback table 1 Suo Shi.
Mode e, terminal carries out channel measurement respectively in 8 CSI-RS, obtains channel matrix H 1 ~ H8, calculates respectively and obtains each CSI-RS channel condition information separately, be expressed as RI_i, PMI_i, CQI_i (i=1 ~ 8); Therefrom choose minimum CQI value CQI_i (i=1 ~ 8), if CSI-RS corresponding to minimum CQI value has multiple, so Stochastic choice one from each CSI-RS corresponding to minimum CQI value.Obtain and select CSI_RS resource corresponding RI_i, PMI_i and CQI_i and feed back.RI, PMI are identical with existing method with CQI feedback method.Alternatively, according to the mark i of the CSI_RS resource of the selection of feedback table 1 Suo Shi.
Mode f, terminal carries out channel measurement respectively in 8 CSI-RS, obtains channel matrix H 1 ~ H8, calculates respectively and obtains each CSI-RS channel condition information separately, be expressed as RI_i, PMI_i, CQI_i (i=1 ~ 8); Calculate the mean value of all order RI_i (i=1 ~ 8) and after rounding (round up or round) downwards, obtain average rank value, and calculate the mean value of all channel matrixes, obtain equivalent channel matrix H; Calculate corresponding PMI and CQI according to equivalent channel matrix H and average rank value, using PMI and CQI that obtain and average rank value as information feedback to base station.Wherein, RI, PMI are identical with existing method with CQI feedback method.
In second specific embodiment, 8 CSI-RS are divided into two groups by terminal, obtaining a set of channel condition information, obtaining two cover channel condition informations altogether from often organizing CSI-RS, feed back these two groups of channel condition informations respectively to base station.
Such as: terminal carries out channel measurement respectively in 8 CSI-RS, obtain channel matrix H 1 ~ H8,8 CSI-RS are divided into two groups, suppose first group comprise CSI-RS corresponding to channel matrix H 1 ~ H4, second group comprise CSI-RS corresponding to channel matrix H 5 ~ H8.A set of channel condition information is obtained from first group of CSI-RS according to any one in the method a-f in the first specific embodiment; And obtain a set of channel condition information according to any one in the method a-f in the first specific embodiment from second group of CSI-RS.Terminal overlaps information feedbacks to base station two respectively.
Based on same inventive concept, additionally provide a kind of terminal in the embodiment of the present invention, the concrete enforcement of this terminal can see the description of said method part, and repeat part and repeat no more, as shown in Figure 3, this terminal mainly comprises:
Acquisition module 301, for obtaining each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
Determination module 302, for each described channel matrix determination intermediate parameters obtained according to described acquisition module 301, determine one group or two groups of channel condition informations according to described intermediate parameters, often organize described channel condition information and comprise order, pre-coding matrix instruction and channel quality information;
Sending module 303, sends to base station for described a group or the two groups of channel condition informations determined by described determination module 302.
Particularly, the line number of the number of CSI-RS and the antenna of base station side or columns identical.If base station sends measurement pilot frequency from every array antenna, then the number of CSI-RS is identical with the columns of the antenna of base station side; If base station sends measurement pilot frequency from every row antenna, then the number of CSI-RS is identical with the line number of the antenna of base station side.
Preferably, to determine that the mode of one group of channel condition information has following several for determination module 302:
The first, determination module 302 specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
The second, determination module 302 specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
The third, determination module 302 specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
Preferably, in this third execution mode, described determination module 302 specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, in this third execution mode, described sending module 303 also for:
The mark of the described CSI-RS selected is sent to described base station.
Preferably, plural CSI-RS is divided into two groups by determination module 302, determine often to organize CSI-RS intermediate parameters separately according to often organizing each described channel matrix corresponding to CSI-RS, determining often to organize each self-corresponding one group of channel condition information of CSI-RS according to often organizing CSI-RS described intermediate parameters separately, obtaining two groups of channel condition informations.Specific implementation includes but not limited to following several:
The first, determination module 302 specifically for:
Plural CSI-RS is divided into two groups, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining two groups of channel condition informations according to often organizing each self-corresponding equivalent channel matrix of CSI-RS.
The second, determination module 302 specifically for:
Described plural CSI-RS is divided into two groups, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtain and often organize each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
The third, determination module 302 specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups;
Respectively for often organizing CSI-RS, each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Calculate one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
Preferably, in this third execution mode, described determination module 302 specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, in this third execution mode, sending module 303 also for:
The mark of the described CSI-RS selected is sent to described base station.
Based on same inventive concept, a kind of terminal is additionally provided in the embodiment of the present invention, the concrete enforcement of this terminal can see the description of said method part, repetition part repeats no more, as shown in Figure 4, this terminal mainly comprises the processor 401, memory 402 and the transceiver 403 that are connected by bus, and transceiver 403 for transmitting and receive data under the control of processor 401, processor 401, for reading the program in memory 402, performs following process:
Obtain each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
According to each described channel matrix determination intermediate parameters, determine one group or two groups of channel condition informations according to described intermediate parameters, often organize described channel condition information and comprise order, pre-coding matrix instruction and channel quality information;
Described one group or two groups of channel condition informations are sent to base station by instruction transceiver 403.
Particularly, the line number of the number of CSI-RS and the antenna of base station side or columns identical.If base station sends measurement pilot frequency from every array antenna, then the number of CSI-RS is identical with the columns of the antenna of base station side; If base station sends measurement pilot frequency from every row antenna, then the number of CSI-RS is identical with the line number of the antenna of base station side.
Preferably, to determine that the mode of one group of channel condition information has following several for processor 401:
The first, processor 401 specifically for:
The mean value calculating each described channel matrix obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
The second, processor 401 specifically for:
The mean value calculating each described channel matrix obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
The third, processor 401 specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
Preferably, in this third execution mode, processor 401 specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, in this third execution mode, described transceiver 403 also for:
The mark of the described CSI-RS selected is sent to described base station.
Preferably, plural CSI-RS is divided into two groups by processor 401, determine often to organize CSI-RS intermediate parameters separately according to often organizing each described channel matrix corresponding to CSI-RS, determining often to organize each self-corresponding one group of channel condition information of CSI-RS according to often organizing CSI-RS described intermediate parameters separately, obtaining two groups of channel condition informations.Specific implementation includes but not limited to following several:
The first, processor 401 specifically for:
Plural CSI-RS is divided into two groups, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining two groups of channel condition informations according to often organizing each self-corresponding equivalent channel matrix of CSI-RS.
The second, processor 401 specifically for:
Described plural CSI-RS is divided into two groups, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtain and often organize each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained each order of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
The third, processor 401 specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups;
Respectively for often organizing CSI-RS, each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Calculate one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
Preferably, in this third execution mode, processor 401 specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
Preferably, described special parameter is order or channel quality information.
Preferably, in this third execution mode, transceiver 403 also for:
The mark of the described CSI-RS selected is sent to described base station.
Based on technique scheme, in the embodiment of the present invention, terminal is after each self-corresponding channel matrix of the multiple CSI-RS of acquisition, according to each channel matrix determination intermediate parameters, determine one group or two groups of channel condition informations according to this intermediate parameters, this group that determines or two groups of channel condition informations are sent to base station, thus when there being multiple CSI process, only need feedback one group or two groups of channel condition informations to base station, reduce feedback overhead, and reduce the computation complexity of base station.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (20)
1. a channel state information feedback method, is characterized in that, comprising:
Terminal obtains each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
Described terminal, according to each described channel matrix determination intermediate parameters, determines one group or two groups of channel condition informations according to described intermediate parameters, often organizes described channel condition information and comprises order, pre-coding matrix instruction and channel quality information;
Described one group or two groups of channel condition informations are sent to base station by described terminal.
2. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
The mean value that described terminal calculates all described channel matrixes obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
3. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described plural CSI-RS is divided into two groups by described terminal, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining channel condition information described in two groups according to often organizing each self-corresponding described equivalent channel matrix of CSI-RS.
4. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
The mean value that described terminal calculates all described channel matrixes obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
5. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described plural CSI-RS is divided into two groups by described terminal, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtains and often organizes each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
6. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined one group of channel condition information according to described intermediate parameters, being comprised:
Described terminal is respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
7. the method for claim 1, is characterized in that, described terminal, according to each described channel matrix determination intermediate parameters, is determined two groups of channel condition informations according to described intermediate parameters, being comprised:
Described terminal, respectively according to each described channel matrix, calculates the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups by described terminal;
Described terminal is respectively for often organizing CSI-RS, and each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Described terminal calculates one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
8. method as claimed in claims 6 or 7, is characterized in that, describedly selects a CSI-RS according to each described special parameter and preset rules, comprising:
Described terminal determines the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Described terminal determines the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
9. method as claimed in claims 6 or 7, it is characterized in that, described special parameter is order or channel quality information.
10. method as claimed in claims 6 or 7, it is characterized in that, described method also comprises:
The mark of the described CSI-RS selected is sent to described base station by described terminal.
11. 1 kinds of terminals, is characterized in that, comprising:
Acquisition module, for obtaining each self-corresponding channel matrix of plural channel state information reference signals CSI-RS;
Determination module, for each described channel matrix determination intermediate parameters obtained according to described acquisition module, determine one group or two groups of channel condition informations according to described intermediate parameters, often organize described channel condition information and comprise order, pre-coding matrix instruction and channel quality information;
Sending module, sends to base station for described a group or the two groups of channel condition informations determined by described determination module.
12. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, determines channel condition information described in a group according to described equivalent channel matrix.
13. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
Described plural CSI-RS is divided into two groups, calculate the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtaining and often organize each self-corresponding equivalent channel matrix of CSI-RS, determining channel condition information described in two groups according to often organizing each self-corresponding described equivalent channel matrix of CSI-RS.
14. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
The mean value calculating all described channel matrixes obtains equivalent channel matrix, calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, the mean value calculating each described order obtains average rank value, calculate according to described equivalent channel matrix and described average rank value and obtain pre-coding matrix instruction and channel quality information, described average rank value, the described pre-coding matrix instruction calculating acquisition and described channel quality information are defined as described one group of channel condition information.
15. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
Described plural CSI-RS is divided into two groups, calculates the mean value often organizing described channel matrix corresponding to each self-contained all CSI-RS of CSI-RS, obtain and often organize each self-corresponding equivalent channel matrix of CSI-RS;
Calculate according to each described channel matrix and obtain order corresponding to each CSI-RS, calculate the mean value often organizing each self-contained all orders of CSI-RS respectively, obtain and often organize each self-corresponding average rank value of CSI-RS;
According to often organizing CSI-RS described equivalent channel matrix separately and respective described average rank value, calculating to obtain and often organizing each self-corresponding pre-coding matrix instruction of CSI-RS and described channel quality information;
According to often organizing each self-corresponding described average rank value of CSI-RS, pre-coding matrix instruction and described channel quality information, determine two groups of channel condition informations.
16. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS, select a CSI-RS according to each described special parameter and preset rules, calculate one group of channel condition information corresponding to described CSI-RS selected as the described channel condition information determined.
17. terminals as claimed in claim 11, is characterized in that, described determination module specifically for:
Respectively according to each described channel matrix, calculate the special parameter obtained in channel condition information corresponding to each CSI-RS;
Described plural CSI-RS is divided into two groups;
Respectively for often organizing CSI-RS, each described special parameter corresponding according to this group CSI-RS and preset rules select a CSI-RS;
Calculate one group of channel condition information corresponding to each described CSI-RS of selection respectively as channel condition information described in two groups that determine.
18. terminals as described in claim 16 or 17, is characterized in that, described determination module specifically for:
Determine the minimum value in each described special parameter, from the CSI-RS that described minimum value is corresponding, select a CSI-RS;
Or,
Determine the maximum in each described special parameter, from the CSI-RS that described maximum is corresponding, select a CSI-RS.
19. terminals as described in claim 16 or 17, it is characterized in that, described special parameter is order or channel quality information.
20. terminals as described in claim 16 or 17, is characterized in that, described sending module also for:
The mark of the described CSI-RS selected is sent to described base station.
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