CN102013956B - A kind of channel state information feedback method and device - Google Patents
A kind of channel state information feedback method and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0031—Multiple signaling transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L2001/125—Arrangements for preventing errors in the return channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
- H04L2025/03802—Signalling on the reverse channel
- H04L2025/03808—Transmission of equaliser coefficients
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Abstract
The invention discloses a kind of channel state information feedback method and device, comprise user terminal (UE) and determine channel condition information.Wherein, channel condition information comprises one of following information combination in any: RI information, CQI information, PMI information; Returned the channel condition information determined to the base station cycle by PUCCH.Wherein PMI information may comprise i1 and i2.The invention provides the technical scheme of feeding back channel state information in lte-a system and ensure that the normality of information feedback.Further, even if when losing RI information or RI and i1 combined coding information, by the inventive method, also ensure that the Normal Feedback of channel condition information, thus ensure that the normal work of communication system.
Description
Technical field
The present invention relates to senior Long Term Evolution (LTE-A, Long Term Evolution Advanced) systems technology, espespecially a kind of channel state information feedback method and device.
Background technology
In wireless communications, if use many antennas at transmitting terminal (as node eNB), the mode of spatial reuse can be taked to improve transmission rate, different data are launched in the different antennae position namely on the running time-frequency resource that transmitting terminal is identical.Also many antennas are used at receiving terminal (as user terminal UE), a kind of situation is, when single user, the resource of all antennas is all distributed to same user, namely a subscriber equipment occupies alone the physical resource distributing to described subscriber equipment in a transmission intercal, and this transmission form is called Single User MIMO (SU-MIMO); Another kind of situation be when multi-user by the Resourse Distribute in different antennae space to different user, namely the physical resource distributing to these subscriber equipmenies shared by a subscriber equipment and at least one other subscriber equipment in a transmission intercal, a subscriber equipment and other subscriber equipment share Same Physical resource by space division multiple access or space division multiplexing mode, this physical resource can be running time-frequency resource, and this transmission form is called multiuser MIMO (MU-MIMO).
At the Long Term Evolution (LTE of third generation partner program normal structure (3GPP), Long termEvolution) in, UE is set to transmit based on following a kind of transmission mode (transmission mode) by high-level signaling semi-static (semi-statically):
Pattern 1: single antenna port: port 0 (Single-antenna port:port 0);
Pattern 2: transmit diversity (Transmit diversity);
Mode 3: Open-Loop Spatial Multiplexing (Open-loop spatial multiplexing);
Pattern 4: Closed-Loop Spatial Multiplexing (Closed-loop spatial multiplexing);
Pattern 5: multi-user's multiple-input and multiple-output (Multi-user MIMO);
Pattern 6: closed loop order (Rank)=1 precoding (Closed-loop Rank=1precoding);
Mode 7: single antenna port: port 5 (Single-antenna port:port 5).
User terminal (UE) feeds back different channel condition informations according to different transmission modes to transmitting terminal, then the channel condition information that transmitting terminal (eNB) feeds back according to UE is again dispatched, and configures new channel condition information for actual transmissions according to certain principle (as heap(ed) capacity principle).Wherein, the channel condition information of feedback comprises: channel quality instruction (CQI, Channel quality indication) information, precoding matrix indicators (PMI, Precoding Matrix Indicator) information and order designator (RI, Rank Indicator) information.Wherein,
CQI, for weighing an index of down channel quality quality.In 36-213 agreement CQI with 0 ~ 15 integer value represent, represent different CQI grades respectively, different CQI correspond to respective modulation system and encoder bit rate (MCS).
RI, for describing the number of space independent channel, the order of respective channels response matrix.Under Open-Loop Spatial Multiplexing and Closed-Loop Spatial Multiplexing pattern, need UE to feed back RI information, under other patterns, do not need feedback RI information.
PMI refers to the call number of the precoding codebook that UE feeds back.Under these 3 kinds of patterns of closed loop of Closed-Loop Spatial Multiplexing, MU-MIMO, RI=1, need to feed back PMI information, under other emission modes, do not feed back PMI information.
The channel condition information of feedback comprises: CQI information, PMI information and RI information.
In LTE system, the feedback of CQI/PMI, RI can be periodic feedback, and also can be acyclic feedback, concrete feedback be as shown in table 1:
| Scheduling method | Periodically CQI channel | Aperiodicity CQI channel |
| Frequency non-selective | PUCCH | |
| Frequency selectivity | PUCCH | PUSCH |
Table 1
In table 1, for CQI/PMI, RI of periodic feedback, if UE does not need to send data, then CQI/PMI, RI of periodic feedback row control channel (Physical Uplink ControlChannel physically, PUCCH) transmit with form 2/2a/2b (PUCCH format2/2a/2b) on, if when UE needs to send data, then CQI/PMI, the RI middle transmission of row shared channel (Physical Uplink SharedChannel, PUSCH) physically; For CQI/PMI, RI of aperiodicity feedback, only transmit on PUSCH.
When carrying out that PMI gives the correct time, UE reports one or more PMI.Carry out PMI and RI in the precoding codebook that the bit mapping parameter codebook subset rule (codebook Subset Restriction) that UE is limited in being configured by high level is specified to report.
According to the semi-static configuration of high level, UE periodically feeds back CQI/PMI/RI information on PUCCH physical channel, and the feedback model of employing is as shown in table 2.
Table 2
There is in each PUCCH Report mode CQI/PMI and the RI Report Type of four different cycles and side-play amount:
Report Type 1 support terminal selects the CQI feedback of subband
Report Type 2 supports that broadband CQI and PMI feeds back
Report Type 3 supports that RI feeds back
Report Type 4 supports broadband CQI
PUCCH channel is not supported high-rise configuration Higher Layer configured (Subband CQI) feedback and Multiple PMI feed back.
In multi-antenna systems, the overhead bit of direct feedback channel response matrix is too large, or channel response matrix is carried out to the decomposition of such as SVD, thus show that best pre-coding matrix feeds back, and its expense is still very large.Therefore, need to construct all known precoding codebook set in some sending and receiving ends, encoder matrix in the best pre-coding matrix obtained and precoding codebook set is contrasted, selects index value corresponding to closest precoding codebook to feed back, overhead bit can be saved greatly like this.The index value of the precoding codebook of these feedbacks is exactly PMI.
These important channel information: PMI/RI/CQI are divided into following two kinds in up feedback kind above:
Periodic feedback, is mainly carried on the feedback on ascending control channel PUCCH.
Non-periodic feedback, is carried on the feedback on Uplink Shared Channel PUSCH.
Periodic feedback must configure, and non-periodic feedback is the feedback of irregular flip-over type, and the non-periodic feedback on PUSCH is the feedback that a kind of precision is higher, belongs to auxiliary, for putting forward high-precision feedback.
Senior Long Term Evolution (LTE-A, Long Term Evolution Advanced) system, as the evolution standard of LTE, supports larger system bandwidth (reaching as high as 100MHz), and the existing standard of backward compatibility LTE.In order to obtain covering and the throughput of higher community mean spectral efficiency and raising cell edge, LTE-A is on the basis of existing LTE system, maximum 8 antennas have been arrived in descending support, and propose the technology that some feedbacks strengthen in code book feedback, the feedback accuracy mainly strengthening code book draws in one's expenditure with the temporal correlation utilizing channel information and/or frequency domain correlation.This technology can improve ternational Mobile Telecommunications (IMT-Advance, the International Mobile Telecommunications-Advance) system of evolution the availability of frequency spectrum, alleviate frequency spectrum resource in short supply.
In lte-a system, information feedback roughly comprises: first, and base station sends pilot tone to UE, and this pilot tone is used for UE and estimates down channel; Then, UE estimates down channel according to pilot signal, determines channel condition information, comprises RI, PMI and CQI; Finally, UE according to feedback model to base station feedback channel condition information.
To sum up, in LTE-A, under supporting the transmission mode of SU/MU, need in broadband/many sub-band channel information of feedback, the channel information transmitted may be needed to have RI, PMI and CQI, wherein PMI information may include the first precoding indicator information (i1) and the first precoding indicator information (i2) two precoding designators.
In sum, in LTE-A, under supporting the transmission mode of SU/MU, need in broadband/many sub-band channel information of feedback, the channel information transmitted may be needed to have RI, PMI and CQI, and wherein PMI information may comprise i1 and i2.Due in LTE-A, need feedback i1 and i2 two precoding designators, this makes in LTE system, only transmit a PMI value in PUCCH channel channel state information feedback method, be specifically related to the method calculating CQI information and PMI information, technical requirement new in LTE-A can not be applicable to.And in prior art, not provide in lte-a system the implementation calculating the method for CQI information and PMI information in how feeding back channel state information.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of channel state information feedback method and device, can to ensure in lte-a system normally feeding back channel state information, and then ensures the normal work of communication system.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of channel state information feedback method, comprises the following steps:
User terminal UE determines channel condition information; Wherein, channel condition information comprises one of following information or combination in any: order designator RI information, channel quality indicator CQI information, precoding matrix indicators PMI information;
By the channel condition information that Physical Uplink Control Channel PUCCH determines to base station periodic feedback.
Described CQI information and PMI information are calculated by RI information respectively and obtain;
Described PMI information comprises: the first precoding matrix indicators i1 information and/or the second precoding matrix indicators i2 information.
The described channel condition information determined to base station periodic feedback by PUCCH is comprised:
When described channel condition information comprises RI information, CQI information, PMI information, described RI information and the first precoding matrix indicators information i1 combined coding, be present in same Report Type; Described CQI information and the second precoding matrix indicators information i2, be present in another Report Type;
Or described RI information absolute coding, is present in a Report Type; Described CQI information, the first precoding matrix indicators information i1 and the second precoding matrix indicators information i2, be present in another Report Type;
Or described CQI information is independently present in a Report Type.
The channel condition information that described feedback is determined specifically comprises:
Described UE, according to the RI value of last feedback and the i1 information finally fed back, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
Described UE, according to the RI value of last feedback, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
Described UE is according to the minimum RI value in bit mapping parameter codebook subset rule and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
Described UE, according to the i1 information of the minimum RI value in bit mapping parameter codebook subset rule and last feedback, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
Described UE, according to the minimum RI value in bit mapping parameter codebook subset rule, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
Described UE is according to the RI value of last feedback and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
Described UE is 1 calculate CQI information according to RI value, and the CQI information obtained is fed back to base station.
Wherein, described bit mapping parameter codebook subset rule is configured by high level and obtains;
A kind of information feedback device, at least comprises: processing module and feedback module, wherein,
Processing module, for determining channel condition information, wherein, channel condition information comprises one of following information or combination in any: RI information, CQI information, PMI information;
Feedback module, for the channel condition information determined to base station periodic feedback by PUCCH.
Described processing module, also for receiving the pilot tone from base station, and estimates down channel according to pilot signal.
Described PMI information comprises the first precoding matrix indicators i1 information and the second precoding matrix indicators i2 information; Described processing module, specifically for:
Combined coding is carried out to described RI information and i1 information, calculates according to RI and i1 united information and obtain CQI information or i2 information; Or,
To described RI information absolute coding, calculate according to RI coded message and obtain i1 information and CQI information, i2 information; Or,
Be 1 calculate acquisition CQI information according to RI value.
Described processing module specifically for:
According to the RI value of last feedback and the i1 information of last feedback, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the RI value of last feedback, calculate CQI information, i1 information and i2 information, and the CQI information obtained, i1 information and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule with fix i1 value, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule and the last i1 information fed back, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule, calculate CQI information, i1 information and i2 information, and the CQI information obtained, i1 information and i2 information are exported to feedback module; Wherein, described bit mapping parameter codebook subset rule is configured by high level and obtains; Or,
According to the RI value of last feedback with fix i1 value, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
Be 1 calculate CQI information according to RI value, and the CQI information obtained is exported to feedback module.
As can be seen from the technical scheme that the invention described above provides, comprise UE and determine channel condition information; Returned the channel condition information determined to the base station cycle by PUCCH.Wherein, channel condition information comprises one of following information or combination in any: RI information, CQI information, PMI information.Wherein PMI information may comprise i1 and i2.The invention provides the technical scheme of feeding back channel state information in lte-a system and ensure that the normality of information feedback.Further, even if when losing RI information or RI and i1 combined coding information, by the inventive method, also ensure that the Normal Feedback of channel condition information, thus ensure that the normal work of communication system.
Accompanying drawing explanation
The feedback schematic diagram of CSI feedback pattern 1 when Fig. 1 is downstream cycle feedback in LTE-A;
The feedback schematic diagram of CSI feedback pattern 2 when Fig. 2 is downstream cycle feedback in LTE-A;
Fig. 3 is the flow chart of channel state information feedback method of the present invention;
Fig. 4 is the composition structural representation of information feedback device of the present invention.
Embodiment
In lte-a system, when considering 8 antenna, main application will be dual-polarized situation, the design of code book and strengthen and also need the feature taking into full account dual polarization channel.The main thought of the feedback technique of this enhancing code book is, the feedback of relative LTE increases the expense of PMI feedback, and utilize the feedback of two PMI jointly to represent the state information of channel, mainly comprise two kinds of implementations: definition dicode originally feeds back with two PMI, or the solid size of this equivalence of definition dicode originally feeds back with two PMI.
Definition dicode originally comprises with two PMI feedback: the structure of the precoding/feedback of a subband is made up of two matrixes.Each matrix in two matrixes is under the jurisdiction of an independent code book.Code book is known by base station and UE simultaneously in advance.The code word of feedback can change to some extent on different time and different subbands.A matrix notation broadband or long time channel attribute.On another matrix notation determination frequency band or the in short-term attribute of channel.The matrix code book used represents with the form of limited denumerable matrix stack, and for UE and base station, each matrix is known.One of them matrix can be a fixing matrix, does not need feedback.Now be equivalent to degenerate to this feedback of solid size (may use in the non-correlation channel situation of high sum of ranks low-rank).
The feedback of channel information based on dicode structure is originally: for needing feedback channel information subband or multiple associating subband, UE to base station feedback two PMI information, (not necessarily feed back simultaneously by some situation, also can predefine PMI be fixed value, do not feed back), be respectively the first precoding matrix indicators information (i1) and the second precoding matrix indicators information (i2), code word W 2 in code word W 1, i2 corresponding another one code book C2 wherein in the corresponding code book C1 of i1.Base station end has the information of identical C1 and C2, finds corresponding code word W 1 and W2 after receiving i1 and i2 from code book C1 and C2 of correspondence, and functional rule F according to a preconcerted arrangement, calculate W=F (W1, W2) and obtain channel information W.
Dicode the design criterion is above a kind of concrete code book form in LTE-A.When specific implementation, only need to define code book corresponding to W1 and W2, but the code book that the W that in fact existence one is virtual is corresponding, the consideration of a lot of aspect of performance is all considered based on the code book that W is corresponding in the design.Further, what code book fed back is designed with two piths, first pith is the concrete structure of W, expense and concrete code word, be directly connected to the performance of this feedback of dicode (although the feedback form of concrete definition is feedback W1 and W2, directly do not feed back W), the consideration of this part is originally all more similar with dicode form originally for solid size.Second pith be how W is split as that 2 code books represent more can the characteristic of adaptive channel time domain/frequency domain change, effectively save expense.This belongs to the consideration of this saving of dicode expense, and solid size does not originally have the consideration of this respect.
Except this implementation of dicode above, also exist a kind of with use dicode this, this feedback system of solid size of two PMI feedback equivalence: the solid size this and couple PMI that defines this equivalence of dicode feed back.
For Rank=r, r is integer, and the place different from 4Tx code book is above, when using this feedback of solid size of this this equivalence of dicode, code word in the code book that feedback is corresponding needs the feedback of 2 PMI to represent its information, and the solid size of this equivalence of dicode originally generally can be expressed as shown in following table 3:
Table 3
In table 3
be one by i
1i
2the code word of common instruction, can be write as functional form W (i usually
1, i
2),
Only need to determine i
1i
2.Such as, during r=1, v
m=[1 e
j2 π m/32e
j4 π m/32e
j6 π m/32]
t, be equivalent to following table 4.
Table 4
In fact, the mode that the solid size defining this equivalence of dicode originally feeds back with two PMI and dicode this pair of PMI equivalence, uniquely different being no longer defines two code book C1 and C2 in this method, the substitute is the code book that the W of definition dicode basis and functional relation formation thereof is corresponding, namely virtual code book be instead of C1 by actual definition, C2.
In LTE-A, under supporting the transmission mode of SU/MU, need in broadband/many sub-band channel information of feedback, the channel information transmitted may be needed to have RI, PMI and CQI, wherein PMI information may include the first precoding indicator information (i1) and the first precoding indicator information (i2) two precoding designators.
The PMI of periodic feedback and CQI information can be calculated by the RI information finally fed back, and when RI information is lost completely, take the given minimum RI value of bit mapping parameter codebook subset rule codebookSubsetRestriction to calculate.Especially, when the RI information dropout of first feedback cycle, by do not have can the RI information of last feedback of reference, so the PMI of first feedback cycle and CQI information are then taked there is minimum RI value and are calculated.Wherein, bit mapping parameter codebook subset rule (codebookSubsetRestriction) is configured by high level and obtains.
In lte-a system during feeding back channel state information, comprise CSI feedback pattern 1 and CSI feedback pattern 2.Wherein, when CSI feedback pattern 1, RI information and i1 information consolidation coding, transmit with the relatively long cycle in same subframe.And CQI information and i2 information are transmitted with the relatively short cycle in other subframe.Specifically as shown in Figure 1.When CSI feedback pattern 2, RI information absolute coding, transmits with the relatively long cycle in a subframe; CQI information and i1 and i2 transmit with the relatively short cycle in another subframe.Specifically as shown in Figure 2.
Fig. 3 is the flow chart of channel state information feedback method of the present invention, as shown in Figure 3, comprising:
Step 300:UE determines channel condition information.Wherein, channel condition information comprises one of following information or combination in any: RI information, CQI information, PMI information.
Wherein, described CQI information and PMI information are calculated by RI information respectively and obtain.
In this step, PMI information comprises: i1 information and/or i2 information.Wherein, CQI information or i2 information are calculated by RI and i1 united information respectively and obtain;
Or i1 information is calculated by RI information to obtain; I2 information is calculated by RI information to obtain; CQI information is calculated by RI information to obtain;
Or, CQI information be by RI be 1 calculating obtain;
Wherein, RI information and i1 information consolidation coding can be adopted, also can adopt RI information absolute coding.
Step 301: the channel condition information determined to base station periodic feedback by PUCCH.
In lte-a system, CSI feedback pattern 1 and CSI feedback pattern 2 during feeding back channel state information, can be comprised.Wherein, when CSI feedback pattern 1, when namely channel condition information comprises RI information, CQI information, PMI information, RI information and i1 information consolidation coding, transmit with the relatively long cycle in same subframe; And CQI information and i2 information are transmitted with the relatively short cycle in other subframe, that is, RI information and i1 information consolidation coding are present in same Report Type, and i2 information and CQI information are present in same Report Type, specifically as shown in Figure 1, the feedback schematic diagram of CSI feedback pattern 1 when Fig. 1 is downstream cycle feedback in LTE-A;
When CSI feedback pattern 2, RI information absolute coding, transmits with the relatively long cycle in a subframe; CQI information, i1 and i2 transmit with the relatively short cycle in another subframe, that is, RI information is present in a Report Type, and i1 information, i2 information and CQI information are present in same Report Type, specifically as shown in Figure 2, the feedback schematic diagram of CSI feedback pattern 2 when Fig. 2 is downstream cycle feedback in LTE-A.
In this step, feed back the channel condition information determined and specifically comprise:
UE, according to the RI value of last feedback and the i1 information finally fed back, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the RI value of last feedback, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
UE is according to the minimum RI value in bit mapping parameter codebook subset rule and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the i1 information of the minimum RI value in bit mapping parameter codebook subset rule and last feedback, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the minimum RI value in bit mapping parameter codebook subset rule, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
UE is according to the RI value of last feedback and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE is 1 calculate CQI information according to RI value, and the CQI information obtained is fed back to base station.
Calculating the RI information of CQI information and i2 information or the mode with i1 information above by determining, when RI information or RI and i1 united information are lost, ensure that Normal Feedback CQI and/or i2 information, thus ensure that the normal operation of whole communication system.
This step specific implementation means are that those skilled in the art easily obtain, and are not intended to limit the scope of the invention, and repeat no more here.
Also comprise before the inventive method: base station sends pilot tone to UE, this pilot tone is used for UE and estimates that down channel UE estimates down channel according to pilot signal.Specific implementation belongs to those skilled in the art's conventional techniques means, repeats no more here.
Corresponding the inventive method also provides middle information feedback device, as described in Figure 4, at least comprises processing module and feedback module, wherein,
Processing module, for determining channel condition information, wherein, channel condition information comprises one of following information or combination in any: RI information, CQI information, PMI information.Specifically for: PMI information comprises i1 information and/or i2 information; Combined coding is carried out to RI information and i1 information, calculates according to RI information and i1 united information and obtain CQI information or i2 information; Or, to RI information absolute coding, calculate according to RI information and obtain CQI information, i1 information and i2 information; Or, be that 1 calculating obtains CQI information according to RI value.
Feedback module, for returning the channel condition information determined to the base station cycle by PUCCH.
Described processing module, specifically for:
According to the RI value of last feedback and the i1 information of last feedback, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the RI value of last feedback, calculate CQI information, i1 information and i2 information, and the CQI information obtained, i1 information and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule with fix i1 value, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule and the last i1 information fed back, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
According to the minimum RI value in bit mapping parameter codebook subset rule, calculate CQI information, i1 information and i2 information, and the CQI information obtained, i1 information and i2 information are exported to feedback module; Wherein, described bit mapping parameter codebook subset rule is configured by high level to obtain; Or,
According to the RI value of last feedback with fix i1 value, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information are exported to feedback module; Or,
Be 1 calculate CQI information according to RI value, and the CQI information obtained is exported to feedback module.
Channel condition information device of the present invention can be arranged in UE.
Below in conjunction with embodiment, the inventive method is described in detail.
Embodiment one, supposes in LTE-A communication system, cycle feeding back channel state information on PUCCH, as shown in Figure 1, as employing feedback model 1-1, and during the mode of RI and i1 combined coding, UE feeding back channel state information comprises RI information, i1 information, i2 information and CQI information.
In embodiment one, RI information and i1 information consolidation coding, transmit with the relatively long cycle in same subframe; CQI information and i2 information are transmitted with the relatively short cycle in other subframe.CQI information in channel condition information and i2 information calculate according to RI and the i1 united information of last feedback.When the RI/i1 information dropout fed back, especially, when RI and the i1 united information of all feedbacks before is all lost, UE calculates and feeding back channel state information one of as follows:
UE is according to the minimum RI value in bit mapping parameter codebook subset rule and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the minimum RI value in bit mapping parameter codebook subset rule, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
UE is 1 calculate CQI information according to RI value, and the CQI information obtained is fed back to base station.
Embodiment two, supposes in lte-a system, cycle feeding back channel state information on PUCCH, as shown in Figure 2, as employing feedback model 1-1, and when being switched to CSI feedback pattern 1 by CSI feedback pattern 2, UE feeding back channel state information comprises RI information, i1 information, i2 information and CQI information.
In embodiment two, CSI feedback pattern 1 refers to RI information and i1 information consolidation coding, transmits in same subframe with the relatively long cycle; CQI information and i2 information are transmitted with the relatively short cycle in other subframe.CSI feedback pattern 2 refers to RI information absolute coding, transmits in a subframe with the relatively long cycle; CQI information and i1 and i2 transmit with the relatively short cycle in another subframe.
Wherein, when CSI feedback pattern 2, the CQI information in channel condition information, i1 information, i2 information are all calculate according to the RI information of last feedback respectively; When CSI feedback pattern 1, the CQI information in channel condition information, i2 information are calculate according to RI and the i1 united information of last feedback respectively.Especially, after being converted to CSI feedback pattern 1, when the RI/i1 united information fed back is lost, especially, when RI and the i1 united information of all feedbacks before is all lost, UE calculates and feeding back channel state information one of as follows:
UE, according to the RI value of last feedback and the i1 information finally fed back, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the RI value of last feedback, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
UE is according to the minimum RI value in bit mapping parameter codebook subset rule and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the i1 information of the minimum RI value in bit mapping parameter codebook subset rule and last feedback, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE, according to the minimum RI value in bit mapping parameter codebook subset rule, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station; Or,
UE is according to the RI value of last feedback and fix i1 value, jointly calculates CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or,
UE is 1 calculate CQI information according to RI value, and the CQI information obtained is fed back to base station.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a channel state information feedback method, is characterized in that, comprises the following steps:
User terminal UE determines channel condition information; Wherein, channel condition information comprises one of following information or combination in any: order designator RI information, channel quality indicator CQI information, precoding matrix indicators PMI information, and described PMI information comprises the first precoding matrix indicators i1 information and/or the second precoding matrix indicators i2 information;
By the channel condition information that Physical Uplink Control Channel PUCCH determines to base station periodic feedback; Wherein, the channel condition information that described feedback is determined specifically comprises: described UE is according to the minimum RI value in bit mapping parameter codebook subset rule and fix i1 value, jointly calculate CQI information and i2 information, and by the CQI information that obtains and i2 information feed back to base station; Or described UE, according to the i1 information of the minimum RI value in bit mapping parameter codebook subset rule and last feedback, calculates CQI information and i2 information jointly, and by the CQI information that obtains and i2 information feed back to base station; Or described UE, according to the minimum RI value in bit mapping parameter codebook subset rule, calculates CQI information, i1 information and i2 information, and by the CQI information, i1 information and the i2 information feed back that obtain to base station.
2. channel state information feedback method according to claim 1, is characterized in that, described CQI information and PMI information are calculated by RI information respectively and obtain.
3. channel state information feedback method according to claim 1, is characterized in that, the described channel condition information determined to base station periodic feedback by PUCCH is comprised:
When described channel condition information comprises RI information, CQI information, PMI information, described RI information and the first precoding matrix indicators information i1 combined coding, be present in same Report Type; Described CQI information and the second precoding matrix indicators information i2, be present in another Report Type;
Or described RI information absolute coding, is present in a Report Type; Described CQI information, the first precoding matrix indicators information i1 and the second precoding matrix indicators information i2, be present in another Report Type;
Or described CQI information is independently present in a Report Type.
4. an information feedback device, is characterized in that, at least comprises: processing module and feedback module, wherein,
Processing module, for determining channel condition information, wherein, channel condition information comprises one of following information or combination in any: RI information, CQI information, PMI information; Or comprise RI information and CQI information, described PMI information comprises the first precoding matrix indicators i1 information and/or the second precoding matrix indicators i2 information; Described processing module, specifically for according to the minimum RI value in bit mapping parameter codebook subset rule with fix i1 value, jointly calculates CQI information and i2 information, and the CQI information obtained and i2 information is exported to feedback module; Or, according to the minimum RI value in bit mapping parameter codebook subset rule and the last i1 information fed back, jointly calculate CQI information and i2 information, and the CQI information obtained and i2 information exported to feedback module; Or, according to the minimum RI value in bit mapping parameter codebook subset rule, calculate CQI information, i1 information and i2 information, and the CQI information obtained, i1 information and i2 information exported to feedback module; Wherein, described bit mapping parameter codebook subset rule is configured by high level and obtains;
Feedback module, for the channel condition information determined to base station periodic feedback by PUCCH.
5. channel condition information device according to claim 4, is characterized in that, described processing module, also for receiving the pilot tone from base station, and estimates down channel according to pilot signal.
6. information feedback device according to claim 4, is characterized in that, described processing module, specifically for:
Combined coding is carried out to described RI information and i1 information, calculates according to RI and i1 united information and obtain CQI information or i2 information; Or,
To described RI information absolute coding, calculate according to RI coded message and obtain i1 information and CQI information, i2 information.
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