CN101567762B - Feedback method and device of channel information - Google Patents
Feedback method and device of channel information Download PDFInfo
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- CN101567762B CN101567762B CN200810036650A CN200810036650A CN101567762B CN 101567762 B CN101567762 B CN 101567762B CN 200810036650 A CN200810036650 A CN 200810036650A CN 200810036650 A CN200810036650 A CN 200810036650A CN 101567762 B CN101567762 B CN 101567762B
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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
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
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Abstract
The invention provides a feedback method of channel information, comprising: during at least one moment, determining differential information of the current channel information corresponding to at least one data stream relative to the channel information at the previous moment; and feeding back the differential information. The invention also provides a feedback device of the channel information. In the invention, the differential information of the channel information corresponding to at least one data stream is fed back. As the differential information of the channel information is small in the information volume relative to the channel information, the bit numbers used by the differential information of the feedback channel information are less than the bit numbers used by the feedback channel information, thereby network resources are saved.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to the feedback technique of channel information.
Background technology
Multiple-input and multiple-output (MIMO; Multi-Input Multi-Output) application of technology in wireless communication system more and more comes into one's own; No matter be that MIMO has its irreplaceable superiority from angle that increases power system capacity or the angle of improving systematic function.In OFDM (OFDM, OrthogonalFrequency Division Multiplxing) system, the application of MIMO has increased the throughput of system equally effectively.MIMO mainly is divided into two big types of technology; One type be with the maximization diversity gain be the space diversity reception to communicate of purpose; Another kind of then is to be the space division multiplexing technology of purpose with maximize data speed, wherein, can be divided into following two kinds of typical patterns again based on the space division multiplexing technology of MIMO:
(1) single codeword (SCW, Single Code Word) pattern
As shown in Figure 1, data flow to be sent at first through chnnel coding, interweave and operation such as planisphere mapping, be the data flow of multichannel phase same rate along separate routes through splitter then, these data flow are launched through different antennas respectively again.According to the difference of the multi-access mode that system adopted, these data flow take channel resources such as identical channel code, frequency or time, so with regard to coded modulation, have only one tunnel independent data stream.For example; To code division multiple access (CDMA; Code-Division Multiple Access) system, a plurality of transmitting antennas use identical channel code, and the pair of orthogonal frequency division multiple access inserts (OFDMA; Orthogonal Frequency Division Multiple Access) system, a plurality of transmitting antennas use one group of identical subcarrier etc.In Fig. 1, channelizing handle promptly according to multi-access mode that system adopted with the signal of respective antenna carry out spread spectrum (to cdma system), subcarrier mapping (to the OFDMA system) waits processing accordingly.
(2) many code words (MCW, Multiple Code Word) pattern
As shown in Figure 2, data flow to be sent is the data flow of M road different rates at first along separate routes, then respectively through chnnel coding independently, interweave and operation such as planisphere mapping; (M≤T) launch promptly has the data flow of M absolute coding modulation (to suppose that each antenna is independent mutually, M the independent beam that M can be the quantity of transmitting antenna, is formed by a plurality of antennas, M absolute coding modulated data blocks of transmission simultaneously, like super broad band radio communication (UMB by T transmitting antenna respectively at last; Ultra-Wideband) the effective antenna number mentioned in the agreement or M the independent data stream that forms by a plurality of antennas; Under the situation that does not cause ambiguity, for for simplicity, the hereinafter unification is explained with " M data flow "; Be reported to be independent data stream no longer specially; Especially, as far as SCW, M=1).Likewise, according to the difference of the multi-access mode that system adopted, this M data flow takies identical channel code or channel resources such as frequency or time.For example, concerning cdma system, M data flow used identical channel code, and concerning the OFDMA system, M data flow used one group of identical subcarrier etc.
At present, when flowing corresponding channel information, need the corresponding channel information of all data flow of feedback to MCW pattern feedback data.But the inventor is through scrutinizing the back discovery, and the quantity of event data stream is more, and then the channel information quantity of feedback is also more, so just needs to use a large amount of bit ability feedback channel informations, and then causes Internet resources by too much taking.
Summary of the invention
The technical problem that the embodiment of the invention will solve is to provide a kind of feedback method of channel information and device, in order to save Internet resources when the feedback channel information.
The embodiment of the invention provides a kind of feedback method of channel information, comprising: at least one constantly, confirm the differential information of the corresponding current channel information of at least one data flow with respect to the channel information in the previous moment; Feed back said differential information.
The embodiment of the invention provides a kind of feedback device of channel information, comprising: confirm the unit, be used at least one constantly, confirm the differential information of the corresponding current channel information of at least one data flow with respect to the channel information in the previous moment; Feedback unit is used to feed back the differential information that said definite unit is confirmed.
In an embodiment of the present invention, the differential information of the channel information of at least one data flow correspondence of feedback.Because the differential information of channel information is little with respect to the amount of information of channel information, so the employed bit number of the differential information of feedback channel information lacks than the employed bit number of feedback channel information, thereby has saved Internet resources.
Description of drawings
Fig. 1 is the sketch map of the SCW of prior art;
Fig. 2 is the sketch map of the MCW of prior art;
Fig. 3 is the flow chart of the channel information feedback method of the embodiment of the invention;
Fig. 4 is the structural representation of the feedback of channel information device of the embodiment of the invention.
Embodiment
At first the feedback method of channel information to the embodiment of the invention describes.Said method can comprise: at least one constantly, confirm the differential information of the corresponding current channel information of at least one data flow with respect to the channel information in the previous moment; Feed back said differential information.The moment here can refer to Transmission Time Interval (TTI, Transmission Time Interval).When confirming differential information; Can also confirm the current channel information that other data flow are corresponding; When feeding back said differential information, can also feed back the corresponding current channel information of said other data flow, feed back the bit number that said differential information uses and be less than the bit number that feeds back said channel information.Other data flow here are at least one data flow except that confirming the differential information corresponding data flow.
During the feedback differential information, can use 1 said differential information of bit feedback.If confirmed 1 current channel information that data flow is corresponding; Then can use the corresponding channel information of the individual bit feedback all data streams of N+ (M-1) or the differential information of channel information; Wherein, N is the bit number that the corresponding channel information of a data flow uses, and M is the quantity of all data streams.
During the feedback differential information, can use 2 said differential information of bit feedback.If confirmed 1 current channel information that data flow is corresponding; Then can use corresponding channel information or the differential information of all data flow of N+ (M-1) * 2 bit feedback; Wherein, N is the bit number that the corresponding channel information of a data flow uses, and M is the quantity of all data streams.
During the feedback differential information, can use to be not less than log
2The said differential information of 3 a minimum positive integer bit feedback (for example comprising rising, the constant or information that descends).If confirmed the current channel information that 1 data flow is corresponding, then use N+ [(M-1) * log
23] corresponding channel information or the differential information of all data flow of individual bit feedback, wherein, [(M-1) * log
23] expression is not less than (M-1) * log
23 positive integer, N is the bit number that the corresponding channel information of a data flow uses, M is the quantity of all data streams.
Obviously, when confirming the corresponding current channel information of at least one data flow, can confirm the differential information of the corresponding current channel information of whole data flow with respect to the channel information of previous TTI with respect to the differential information of the channel information of previous TTI.
In addition,, the current channel information that at least one data flow is corresponding can be confirmed, during feedback, said current channel information can be fed back at least one moment except that above-mentioned at least one moment.
In addition, when specified data flows channel information or the differential information of current correspondence, can optionally confirm corresponding channel information or the differential information of at least one data flow wherein.When channel information that optionally definite at least one data flow wherein is corresponding or differential information, can be according to corresponding channel information or the differential information of rule grouping specified data stream that is provided with in advance.When flowing corresponding channel information or differential information, can confirm the channel information or the differential information of a part of data flow correspondence of regulation at odd number constantly according to the rule grouping specified data that is provided with in advance; In even number constantly, confirm the corresponding channel information or the differential information of other a part of data flow of regulation.
For further reducing feedback quantity, when feedback channel information or differential information, can optionally feed back to data flow.For example, according to corresponding channel information or the differential information of rule grouping feedback data stream that sets in advance.With 4 data flow is example, feeds back first, second data flow corresponding channel information or channel information difference constantly at odd number, feeds back the 3rd, the 4th data flow corresponding channel information or channel information difference constantly in even number.If data flow is more, can further be divided into three groups or more groups to all data flow, when feeding back at every turn, can a feedback corresponding channel information or the differential information of one or more groups data flow wherein.Because feedback principle and mode and feedback all data streams are just the same, repeat no more here.
In practical application; Channel information can be channel quality indication (CQI; Channel QualityIndication), the SINR or the channel characteristic value that for example comprise channel gain, Signal to Interference plus Noise Ratio (SINR, Signal toInterference plus Noise Ratio), quantification.Under the UMB system, can use the reverse multi-input multi-ouput channel quality indicator channel of MCW (r-mqich) feedback differential information or channel information.
Before the embodiment of the invention was elaborated, the correlation technique that earlier the UMB2.0 agreement is related to was here introduced.In the UMB2.0 agreement, all classify as multi-input multi-ouput channel quality indication (MCQI, MIMO Channel Quality Indicator) feedback to the feedback of SCW and MCW.Here consider the situation of 4 data flow; The feedback format of multi-input multi-ouput channel quality indicator channel single codeword pattern report (Format for MQICHSCW Report) can be as shown in table 1, and the feedback format of the many patterns of code words reports of multi-input multi-ouput channel quality indicator channel (Format for MQICHMCW Report) can be as shown in table 2.
| Territory (Field) | Length (bit) (Length (bits)) |
| Multi-input multi-ouput channel quality indicated value single codeword pattern (MCQIValueSCW) | 5 |
| Order (Rank) | 2 |
Table 1
| Territory (Field) | Length (bit) (Length (bits)) |
| Many patterns of code words of multi-input multi-ouput channel quality indicated value layer 1 (MCQIValueMCWLayer1) | 4 |
| Many patterns of code words of multi-input multi-ouput channel quality indicated value layer 2 (MCQIValueMCWLayer2) | 4 |
| Many patterns of code words of multi-input multi-ouput channel quality indicated value layer 3 (MCQIValueMCWLayer3) | 4 |
| Many patterns of code words of multi-input multi-ouput channel quality indicated value layer 4 (MCQIValueMCWLayer4) | 4 |
Table 2
In the UMB2.0 agreement, because the difference of other relevant parameters, the physical meaning that is characterized is different, but feedback all is the reflection to the CQI value.
In the UMB system; Multi-input multi-ouput channel quality indicator channel (MCQICH; Also can be written as MQICH), subband feedback channel (SFCH) is with other logic channels; All multiplexing going up at reverse OFDMA CCCH (R-ODCCH, Reverse OFDMA Dedicated ControlChannel) transmitted.The multiplexing pattern on R-ODCCH of various logical channels is as shown in table 3.
| Head value (Header Value) | Reverse channel quality indication channel (4 bit) (r-cqich (4bits)) | Reverse request channel (6 bit) (r-reqch (6bits)) | Reverse subband feedback channel (8 bit) (r-sfch (8 bits)) | Reverse wave beam feedback channel (8 bit) (r-bfch (8bits)) | Single codeword mode back multi-input multi-ouput channel quality indicator channel (7 bit) (scw r-mqich (7bits)) | The reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words (4 bit/layer) (mcw r-mqich (4 bits/layer)) | The bit of reserving (Reserved bits) |
| ‘000’ | 1 | 0 | ?1 | 1 | 0 | 0 | ?2 |
| ‘001’ | 1 | 0 | 2 | 0 | 0 | 0 | 2 |
| ‘010’ | 1 | 1 | 1 | 0 | 0 | 0 | 4 |
| ‘011’ | 1 | 1 | 0 | 1 | 0 | 0 | 4 |
| ‘100’ | 1 | 0 | 1 | 0 | 1 | 0 | 3 |
| ‘101’ | 1 | 0 | 0 | 1 | 1 | 0 | 3 |
| ‘110’ | 1 | 1 | 0 | 0 | 1 | 0 | 5 |
| ‘100’ | 1 | 0 | 0 | 0 | 0 | 4 | 2 |
| ‘101’ | 1 | 1 | 0 | 0 | 0 | 3 | 0 |
| ‘110’ | 0 | 1 | 0 | 0 | 0 | 4 | 0 |
Table 3
In table 3; 100,101 and 110 is multiplexing twice; This is because the feedback model of MIMO can only be a kind of pattern among SCW or the MCW, and can know current MIMO pattern through top signaling between base station and the subscriber equipment; So 100,101 and 110 can't clash for multiplexing twice.
Can find out by table 3; When adopting the MCW feedback model; The needed load of R-ODCCH is maximum, and 101 and 110 to be example, (situation with 101 is an example all to need 22 bits; Required total number of bits is 4 bits of reverse channel quality indication channel, 6 bits of reverse request channel and 4 * 3 bit sums of the reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words); Particularly MCW in order to make the bit number of total load constant, has also reduced one deck feedback in 101, and feedack is incomplete beyond doubt like this.Especially, SCW has considered the feedback of SFCH, and MCW does not then consider; This has in fact also increased the difficulty of transmitting terminal scheduling; And will be reflected at last on the throughput of system, this be because, under the situation of not selecting subband; Do not satisfy the situation of MCS for fear of the subband that is dispatched to, the CQI that is fed back can only be the MCS mean value on the whole frequency band.In addition, under 101 and the 110 two kind of situation of MCW, all there is not reserved bit, so extensibility is relatively poor.
Use MCW r-mqich feedback channel information or channel differential information to be example as channel information, under the UMB system with the SINR after quantizing below, the embodiment of the invention is elaborated.As shown in Figure 3, said method can comprise:
Step S301: at least one constantly, confirm the difference of the SINR after SINR after the current quantification of at least one data flow is with respect to the quantification in the previous moment.The moment here can refer to TTI.
During the difference of the SINR after confirm quantizing; Can confirm the difference of the SINR after the quantification of a data flow; Also can confirm the difference of the SINR after the quantification of a plurality of data flow, confirm that specifically the difference of the SINR after the quantification of what data flow can be decided according to the actual requirements.Before the difference of SINR after confirm quantizing, can confirm the SINR after the current quantification, in addition, can also preserve the SINR after the current quantification, so that use during the difference of the SINR after a back TTI confirms to quantize.After confirming the SINR after the current quantification, can the SINR after the quantification of SINR after the current quantification and previous TTI be compared, obtain difference.
During the difference of the SINR after confirm quantizing, can also confirm the SINR after the current quantification of other data flow.For example, suppose that the base station forms 4 data flow, then can confirm wherein the SINR after the current quantification of 1 data flow, confirm the difference of the SINR after other 3 data flowizations.
For further reducing feedback quantity, can also optionally feed back to data flow.For example, adopt the method that a plurality of data stream packet are fed back.Be example still with 4 data flow; SINR difference after SINR after odd number TTI feeds back first, second data flow corresponding quantitative constantly or the quantification; SINR difference after even number TTI feeds back the 3rd, the 4th SINR after the data flow corresponding quantitative constantly or quantizes; Because feedback principle and mode and feedback all data streams are just the same, repeat no more here.
Step S302: use MCW r-mqich to feed back said difference.
MCW r-mqich is a logic channel, and it can be multiplexing on this physical channel of R-ODCCH with other logic channels.The bit number that R-ODCCH uses is relatively-stationary, if the bit number summation that all logic channels use is less than the bit number that R-ODCCH uses, then R-ODCCH can have idle bit to be used to transmit other information.
Feedback is during difference, can also feed back the SINR after the current quantification of other data flow, and certainly, the bit number that the feedback difference is used is less than the bit number of the SINR behind the feedback quantization.In general, in the UMB system, when using the SINR behind the MCW r-mqich feedback quantization, the employed bit number of the SINR behind the feedback quantization is no more than 4.
During the feedback difference, can use 1 bit feedback difference among the MCW r-mqich.The difference of SINR after the quantification can be 0, also can be 1.0 can represent that SINR reduces, and 1 can represent that SINR rises.
An example of the structure chart of the SINR when table 4 forms 4 data flow for the base station behind the feedback quantization, TTI j representes j TTI, j is a positive integer, and with 4 certain corresponding relation is arranged, such as being divided exactly by 4.
Table 4
Visible by table 4, the SINR behind the feedback quantization can use preceding 4 bits, feeds back the difference of the SINR after the quantification of other data flow and can use back 3 bits.The bit number that the feedback difference is used can be influential to the total number of bits of MCW r-mqich.For example; Suppose that the base station forms M data flow; The employed bit number of SINR after the quantification of a data flow of feedback is N; If the only SINR after the current quantification of definite wherein 1 data flow, and the difference of the SINR after the quantification of definite (M-1) individual data flow, then the employed bit number of MCW r-mqich feedback MCS information is N+ (M-1).
When SINR, other data flow after the base station forms the quantification of the data flow of 4 bit feedback among 4 data flow, the use MCW r-mqich are then all used 1 bit feedback difference among the MCW r-mqich; The total number of bits of MCW r-mqich is 7, and the structure of R-ODCCH is as shown in table 5.
| Head value (Header Value) | Reverse channel quality indication channel (4 bit) (r-cqich (4bits)) | Reverse request channel (6 bit) (r-reqch (6bits)) | Reverse subband feedback channel (8 bit) (r-sfch (8 bits)) | Reverse wave beam feedback channel (8 bit) (r-bfch (8bits)) | Single codeword mode back multi-input multi-ouput channel quality indicator channel (7 bit) (scw r-mqich (7bits)) | The reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words (7 bit) (mcw r-mqich (7 bits) | Bit number sum (total bits) |
| ‘000’ | 1 | 0 | ?1 | 1 | 0 | 0 | 20 |
| ‘001’ | 1 | 0 | 2 | 0 | 0 | 0 | 20 |
| ‘010’ | 1 | 1 | 1 | 0 | 0 | 0 | 18 |
| ‘011’ | 1 | 1 | 0 | 1 | 0 | 0 | 18 |
| ‘100’ | 1 | 0 | 1 | 0 | 1 | 0 | 19 |
| ‘101’ | 1 | 0 | 0 | 1 | 1 | 0 | 19 |
| ‘110’ | 1 | 1 | 0 | 0 | 1 | 0 | 17 |
| ‘100’ | 1 | 0 | 0 | 0 | 0 | 1 | 11 |
| ‘101’ | 1 | 1 | 0 | 0 | 0 | 1 | 17 |
| ‘110’ | 0 | 1 | 0 | 0 | 0 | 1 | 13 |
Table 5
Visible by table 5; Amended R-ODCCH is with respect to table 3, and bit number is reduced to 20 bits by 22 bits (under the MCW pattern, 101 and 110 all need 22 bits) at most; MCW r-mqich has vacated a large amount of bits, and the bit number that R-ODCCH reserves has increased.Like this, even after transmitting antenna increases, layer (Layer) number increases; After supported independent data stream increases; Also need not to increase the bit number of R-ODCCH, not only reduced the load of R-ODCCH, also strengthened autgmentability; As by existing 4 transmit antenna case; Can form 4 data flow at most, can consider in the corresponding channel of MCW, to include the another one channel in and continue to keep the R-ODCCH length (22 bit) the same, make the load of R-ODCCH obtain expansion so too with table 3.
During the feedback difference, also can use the difference of 2 each data flow of bit feedback among the MCW r-mqich.For example; Suppose that the base station forms M data flow; The employed bit number of SINR after the quantification of a data flow of feedback is N; If the only SINR after the current quantification of definite 1 data flow, and the difference of the SINR after the quantification of definite (M-1) individual data flow, then SINR behind the MCW r-mqich feedback quantization or the employed bit number of its difference are N+ (M-1) * 2.States such as in addition, when using 2 bit feedback differences, SINR after difference can be represented to quantize rises 1, descend 1, constant and other changes.
When the base station forms M data flow; When SINR, other data flow after the quantification of the data flow of 4 bit feedback among the use MCW r-mqich are then all used 2 bit feedback differences among the MCW r-mqich; The total number of bits of MCW r-mqich is 10, and the structure of R-ODCCH is as shown in table 6.
| Head value (Header Value) | Reverse channel quality indication channel (4 bit) (r-cqich (4bits)) | Reverse request channel (6 bit) (r-reqch (6bits)) | Reverse subband feedback channel (8 bit) (r-sfch (8 bits)) | Reverse wave beam feedback channel (8 bit) (r-bfch (8bits)) | Single codeword mode back multi-input multi-ouput channel quality indicator channel (7 bit) (scw r-mqich (7 bits)) | The reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words (10 bit) (mcw r-mqich (10 bits) | Bit number sum (total bits) |
| ‘000’ | 1 | 0 | ?1 | 1 | 0 | 0 | 20 |
| ‘001’ | 1 | 0 | ?2 | 0 | 0 | 0 | 20 |
| ‘010’ | 1 | 1 | ?1 | 0 | 0 | 0 | 18 |
| ‘011’ | 1 | 1 | ?0 | 1 | 0 | 0 | 18 |
| ‘100’ | 1 | 0 | ?1 | 0 | 1 | 0 | 19 |
| ‘101’ | 1 | 0 | ?0 | 1 | 1 | 0 | 19 |
| ‘110’ | 1 | 1 | ?0 | 0 | 1 | 0 | 17 |
| ‘100’ | 1 | 0 | ?0 | 0 | 0 | 1 | 14 |
| ‘101’ | 1 | 1 | ?0 | 0 | 0 | 1 | 20 |
| ‘110’ | 0 | 1 | ?0 | 0 | 0 | 1 | 16 |
Table 6
Visible by table 6; Though the employed bit number of feedback difference has increased by 1 than table 5; But amended R-ODCCH is with respect to table 3; Bit number still reduces to 20 bits by 22 bits (under the MCW pattern, 101 and 110 all need 22 bits) at most, and MCW r-mqich has vacated a large amount of bits and can expand equally.
During the feedback difference, can also use the log that is not less than among the MCW r-mqich
23 a minimum positive integer bit feedback difference.For example; Suppose that the base station forms M data flow; The employed bit number of SINR after the quantification of a data flow of feedback is N; If only confirm the SINR after the current quantification of 1 data flow, and confirm the difference of the SINR after the quantification of (M-1) individual data flow, then SINR behind the MCW r-mqich feedback quantization and the employed bit number of difference thereof be N+ [(M-1) * log
23], wherein, [(M-1) * log
23] expression is not less than (M-1) * log
23 positive integer.
When 4 data flow of base station formation, SINR, other data flow after the quantification of the data flow of 4 bit feedback among the use MCW r-mqich are then all used the log that is not less than among the MCW r-mqich
2During 3 a minimum positive integer bit feedback difference (for example comprise rising, constant with the information that descends), the total number of bits of MCWr-mqich is 9, and the structure of R-ODCCH is as shown in table 7.
| Head value (Header Value) | Reverse channel quality indication channel (4 bit) (r-cqich (4bits)) | Reverse request channel (6 bit) (r-reqch (6bits)) | Reverse subband feedback channel (8 bit) (r-sfch (8 bits)) | Reverse wave beam feedback channel (8 bit) (r-bfch (8bits)) | Single codeword mode back multi-input multi-ouput channel quality indicator channel (7 bit) (scw r-mqich (7 bits)) | The reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words (9 bit) (mcw r-mqich (9 bits) | Bit number sum (total bits) |
| ‘000’ | 1 | 0 | ?1 | 1 | 0 | 0 | 20 |
| ‘001’ | 1 | 0 | ?2 | 0 | 0 | 0 | 20 |
| ‘010’ | 1 | 1 | ?1 | 0 | 0 | 0 | 18 |
| ‘011’ | 1 | 1 | ?0 | 1 | 0 | 0 | 18 |
| ‘100’ | 1 | 0 | ?1 | 0 | 1 | 0 | 19 |
| ‘101’ | 1 | 0 | ?0 | 1 | 1 | 0 | 19 |
| ‘110’ | 1 | 1 | ?0 | 0 | 1 | 0 | 17 |
| ‘100’ | 1 | 0 | ?0 | 0 | 0 | 1 | 13 |
| ‘101’ | 1 | 1 | ?0 | 0 | 0 | 1 | 19 |
| ‘110’ | 0 | 1 | ?0 | 0 | 0 | 1 | 15 |
Table 7
Visible by table 7, amended R-ODCCH is with respect to table 3, and bit number still reduces to 20 bits by 22 bits (under the MCW pattern, 101 and 110 all need 22 bits) at most, and MCWr-mqich has vacated a large amount of bits and can expand equally.
In sum, from autgmentability, use the mode of 1 bit feedback difference the strongest; From information integrity, use to be not less than log
2The mode of 3 a minimum positive integer bit feedback difference is the most complete; Extract from difference information, use the mode of 2 bit feedback differences the simplest.
In addition, at some constantly, can only feed back the difference of the SINR after the quantification of all data flow.Still be example with R-ODCCH, can be at table 5, increase a kind of state ' 111 ' again after all states of table 6 and table 7, specifically as shown in table 8.
| Head value (Heade r Value) | Reverse channel quality indication channel (4 bit) (r-cqich (4bits)) | Reverse request channel (6 bit) (r-reqch (6bits)) | Reverse subband feedback channel (8 bit) (r-sfch (8bits)) | Reverse wave beam feedback channel (8 bit) (r-bfch (8bits)) | Single codeword mode back multi-input multi-ouput channel quality indicator channel (7 bit) (scw r-mqich (7 bits)) | The reverse multi-input multi-ouput channel quality indicator channel of many patterns of code words (7/10/9 bit) (mcw r-mqich (7/10/9 bits)) | Many patterns of code words (4/8/7 bit) difference (MC W Differen ce) (4/8/7 bits) | Bit number sum (total bits) |
| ‘111’ | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4/8/7 |
Table 8
In table 8, during 1 bit feedback difference in using MCW r-mqich, the employed total number of bits of difference of feeding back the SINR after the quantification of all data flow is 4; During 2 bit feedback differences in using MCW r-mqich, the employed total number of bits of difference of feeding back the SINR after the quantification of all data flow is 8; In using MCW r-mqich, be not less than log
2During 3 minimum positive integer bit feedback difference, the employed total number of bits of difference of feeding back the SINR after the quantification of all data flow is 7.
His-and-hers watches 5 if adopt the mode of the feedback of dividing into groups as previously mentioned, can also further reduce feedback quantity to the feedback model shown in the table 8, because feedback principle and mode and feedback all data streams are just the same, repeat no more here.
Similarly, SCW also can adopt similar feedback model, and is specifically as shown in table 9:
| Head value (Hea der | The reverse channel quality indication letter | Reverse request channel (6 ratios | Reverse subband feedback channel (8 | Reverse wave beam feedback channel (8 | How defeated the many inputs of single codeword mode back are | How defeated the many inputs of single codeword mode back are | The reverse multi-input multi-ouput channel of many patterns of code words | Many patterns of code words (MCW) | Bit number sum (3,4 bit) |
| Value ) | Road (4 bit) (r-cq ich (4 bits)) | Special) (r-req ch (6 bits)) | Bit) (r-sfc h (8 bits)) | Bit) (r-bfc h (8 bits)) | Go out channel quality indicating channel (7 bit) (scw r-mqich (7bits)) | Go out channel quality indicating channel (1/2 bit) (scw Difference (3/4bits)) | Quality indicator channel (7/10/9 bit) (Mcw r-mqich (7/10/9 bits)) | Difference (Differe nce) (4/8/7 bits) | (total bits (3/4bit s)) |
| ‘111’ | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 3/4 |
Table 9
In table 9, on the basis of feedback 2 bit order information, when using 1 bit feedback difference, SCW Difference feeds back 3 bits; When using 2 bits or being not less than log
2During 3 minimum positive integer bit feedback difference, SCW Difference all feeds back 4 bits.
No matter be table 8 or table 9, but all reserved considerable extending space.
More clearly understand embodiments of the invention for ease of those skilled in the art, associative list 10 again describes the embodiment of the invention with a specific embodiment below.For certain data flow, suppose that the SINR value of TTI is-8dB that TTI is-5dB for the second time for the first time; TTI is-4.5dB for the third time, can be known by table 10, and corresponding CQI is respectively 1,2,2; Obtain corresponding quantitative SINR in the base station side deciphering and be-8.5dB-5.5dB ,-5.5dB; For the second time the difference of the SINR after the quantification of TTI and TTI for the first time is 1, and the difference of the SINR after the quantification of TTI and TTI for the second time is 0 for the third time.This shows that from the angle of base station, this data flow is in the SINR value rising of the corresponding SINR value of the TTI second time with respect to the TTI first time, for the third time the SINR value of TTI with respect to the second time TTI the SINR value constant.
| ctol mea?range [dB) | CQI reported | Ctol mea?assumed by?the?scheduler |
| (-∞，-8.5) | 0 | -∞ |
| [-8.5，-5.5) | 1 | -8.5 |
| [5.5，-4.3) | 2 | -5.5 |
| [-4.3，-3.6) | 3 | -4.3 |
| [-3.6，-2.7) | 4 | -3.6 |
| [-2.7，-1.7) | 5 | -2.7 |
| [-1.7，-1.0) | 6 | -1.7 |
| [-1.0，1.2) | 7 | -1.0 |
| [1.2，3.5) | 8 | 1.2 |
| [3.5，5.4) | 9 | 3.5 |
| [5.4，7.4) | 10 | 5.4 |
| [7.4，10.1) | 11 | 7.4 |
| [10.1，12.7) | 12 | 10.1 |
| [12.7，16.4) | 13 | 12.7 |
| [16.4，19.5) | 14 | 16.4 |
| [19.5，∞) | 15 | 19.5 |
Table 10
In table 10, Ctol
MeaThe expression carrier/interface ratio, the SINR of the embodiment of the invention just, CQI reported represent the CQI that reports, Ctol
MeaAfter assumed by the scheduler represented to receive the CQI that reports, scheduler (base station) was thought the corresponding carrier/interface ratio in current this terminal of receiving.
Method shown in Figure 3 can be realized by the device of various ways.As shown in Figure 4; The feedback device of a kind of UMB system lower channel information wherein can comprise: confirm unit 401; Be used for constantly, confirm the differential information of the corresponding current channel information of at least one data flow with respect to the channel information in the previous moment at least one; Feedback unit 402 is used to feed back the differential information that said definite unit is confirmed.The moment here can refer to TTI.
When confirming that differential information is confirmed in unit 401; Can also confirm the current channel information that other data flow are corresponding; Feedback unit 402 is when the differential information that the definite unit 401 of feedback is confirmed; Also feedback is confirmed the current channel information of other data flow correspondences that unit 401 is confirmed, said other data flow are at least one data flow except that confirming the differential information corresponding data flow.
When confirming that unit 401 specified datas flow channel information or the differential information of current correspondence, can optionally confirm corresponding channel information or the differential information of at least one data flow wherein.For example, suppose that there are 4 transmitting antennas the base station, can form 4 independent data streams, at this moment, confirm that unit 401 can only definite corresponding channel information or differential information of 3 data flow wherein.When confirming channel information that unit 401 confirms that optionally wherein at least one data flow is corresponding or differential information, can be according to corresponding channel information or the differential information of rule grouping specified data stream that is provided with in advance.When confirming that unit 401 flows corresponding channel information or differential information according to the rule grouping specified data that is provided with in advance, can confirm the channel information or the differential information of a part of data flow correspondence of regulation at odd number constantly; In even number constantly, confirm the corresponding channel information or the differential information of other a part of data flow of regulation.
When feedback unit 402 said channel informations of feedback or differential information; Confirmed at least two channel information or differential information that data flow is corresponding if confirm unit 401, then feedback unit 402 optionally feeds back corresponding channel information or the differential information of at least one data flow wherein.
For further reducing feedback quantity, channel massage or differential information that feedback unit 402 can also optionally be confirmed to data flow feedback determining unit 401.For example, adopt the method that a plurality of data stream packet are fed back.Be example still with 4 data flow; At odd number TTI constantly; Corresponding channel information or the differential information of feedback unit 402 first, second data flow of feedback, at even number TTI constantly, corresponding channel information or the differential information of feedback unit the 3rd, the 4th data flow of 402 feedbacks; Because feedback principle and mode and feedback all data streams are just the same, repeat no more here.
The bit number that feedback unit 402 feedback differential information are used can be influential to the total number of bits of MCW r-mqich.For example; Suppose that the base station forms M data flow; The employed bit number of differential information of a data flow of feedback is N; Confirm the wherein current channel information of 1 data flow if confirm 401 of unit, and confirm the differential information of (M-1) individual data flow, then the employed bit number of MCW r-mqich feedback channel information or differential information is N+ (M-1).
During feedback unit 402 feedback differential information, also can use 2 bit feedback differential information among the MCW r-mqich.For example; Suppose that the base station forms M data flow; The employed bit number of channel information of a data flow of feedback is N; If confirm 401 the current channel informations of confirming 1 data flow in unit, and confirm the differential information of (M-1) individual data flow, then the employed bit number of MCW r-mqich feedback channel information or differential information is N+ (M-1) * 2.In addition, when using 2 bit feedback differential information, differential information can be represented states such as channel information rises 1, descends 1, constant and other changes.
During feedback unit 402 feedback differential information, can also use the log that is not less than among the MCW r-mqich
23 a minimum positive integer bit feedback differential information (for example comprise rising, constant with the information that descends).For example; Suppose that the base station forms M data flow; The employed bit number of channel information of a data flow of feedback is N; If only confirm the current channel information of 1 data flow, and confirm the differential information of (M-1) individual data flow, then the employed bit number of MCW r-mqich feedback channel information or differential information be N+ [(M-1) * log
23], wherein, [(M-1) * log
23] expression is not less than (M-1) * log
23 positive integer.
In addition, because cycle of channel information of a data flow of feedback may be long, be the feedback of the differential information of avoiding influencing other data flow, at some constantly, feedback unit 402 can only feed back the differential information of all data flow.
In addition, said apparatus can also comprise that is preserved a unit 403, is used to preserve current channel information, so that use when confirming that in a back moment differential information is confirmed in unit 401.For example; Suppose to confirm that unit 401 confirmed channel information constantly at first, at this moment, preserve unit 403 and can preserve this channel information constantly; Second moment; Confirm that unit 401 can confirm the channel information in second moment, the channel information with second moment compares with preserving first channel information constantly of preserving unit 403 afterwards, obtains differential information.
Need to prove that each functional unit in the said apparatus can be arranged in the terminal, the working method of these functional units in the terminal is identical with working method in said apparatus, repeats no more here.
In device embodiment of the present invention, the differential information of the channel information that at least one data flow of feedback unit feedback is corresponding.Because the differential information of channel information is little with respect to the amount of information of channel information, so the employed bit number of the differential information of feedback unit feedback channel information lacks than the employed bit number of feedback channel information, thereby has saved Internet resources.
In method and apparatus embodiment of the present invention; Can come the feedback of receiving channel information or its differential information by the base station, when receiving channel information, the channel information that is about to as current terminal correspondence; When receiving the channel information differential information; With it and the last channel information addition (for example comprise increase, reduce or constant information) of preserving, obtain current channel information and preserve.If current channel information and differential information thereof feedback is wiped free of or feeds back when makeing mistakes, can be the last channel information of preserving as current channel information, and with this benchmark of adjusting as channel information next time.
It is to be noted; No matter adopt any differential feedback mode; The feedback of channel information integrity value still must be sent, its transmission can the cycle also can aperiodic, send the length in cycle or opportunity of sending can be decided in its sole discretion by base station decision or terminal; Such as; Feed back full channel information when twice channel information difference is big before and after a certain data flow is realized at the terminal, and perhaps the base station is found that the channel information difference continuous several times feedback that receives is made mistakes or need wipe the time, can be guided the terminal to send complete channel information.
Like this, in an embodiment of the present invention, because the integrity value that can constantly adjust channel information is as benchmark, so the embodiment of the invention is wiped with feedback error the feedback of CQI all has stronger robustness.
It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, module in the accompanying drawing or flow process might not be that embodiment of the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
One of ordinary skill in the art will appreciate that all or part of processing in the foregoing description method is to instruct relevant hardware to accomplish through program, described program can be stored in a kind of computer-readable recording medium.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (17)
1. a feedback method of channel information is characterized in that, comprising:
At at least one constantly, divide into groups to confirm the differential information of the corresponding current channel information of at least one data flow according to the rule that is provided with in advance with respect to the channel information in the previous moment;
Optionally feed back said differential information to data flow;
Wherein, during the feedback differential information, use 1 bit, or 2 bits, or be not less than log
2The said differential information of 3 a minimum positive integer bit feedback;
When confirming said differential information; Also confirm the current channel information that other data flow are corresponding; When feeding back said differential information; Also feed back the corresponding current channel information of said other data flow, said other data flow are at least one data flow except that confirming the differential information corresponding data flow.
2. feedback method of channel information as claimed in claim 1 is characterized in that, also comprises:
In at least one moment except that said at least one moment, confirm the current channel information that at least one data flow is corresponding;
Feed back said current channel information.
3. according to claim 1 or claim 2 feedback method of channel information is characterized in that the channel information that specified data flows current correspondence is specially: according to the corresponding channel information of rule grouping specified data stream that is provided with in advance.
4. feedback method of channel information as claimed in claim 3; It is characterized in that; Corresponding channel information or the differential information of rule grouping specified data stream according to being provided with in advance specifically comprises: at odd number constantly, confirm the corresponding channel information or the differential information of a part of data flow of regulation; In even number constantly, confirm the corresponding channel information or the differential information of other a part of data flow of regulation.
5. according to claim 1 or claim 2 feedback method of channel information; It is characterized in that; Feeding back said channel information or differential information is specially: if confirmed at least two channel information or differential information that data flow is corresponding, then optionally feed back corresponding channel information or the differential information of at least one data flow wherein.
6. feedback method of channel information as claimed in claim 5; It is characterized in that optionally feedback corresponding channel information or the differential information of at least one data flow wherein is specially: according to corresponding channel information or the differential information of rule grouping feedback data stream that is provided with in advance.
7. feedback method of channel information as claimed in claim 6; It is characterized in that; Corresponding channel information or the differential information of rule grouping feedback data stream according to being provided with in advance specifically comprises: at odd number constantly, and the corresponding channel information or the differential information of a part of data flow of feedback regulation; In even number constantly, the corresponding channel information or the differential information of other a part of data flow of feedback regulation.
8. like any described feedback method of channel information of claim 1-2, it is characterized in that said channel information is SINR or the channel characteristic value after channel gain, Signal to Interference plus Noise Ratio SINR, the quantification.
9. the feedback device of a channel information is characterized in that, comprising:
Confirm the unit, be used for constantly, divide into groups to confirm the differential information of the corresponding current channel information of at least one data flow with respect to the channel information in the previous moment according to the rule that is provided with in advance at least one;
Feedback unit is used for optionally feeding back the differential information that said definite unit is confirmed to data flow; Wherein, when said feedback unit feeds back differential information, use 1 bit, or 2 bits, or be not less than log
2The said differential information of 3 a minimum positive integer bit feedback;
Said definite unit is when confirming said differential information; Also confirm the current channel information that other data flow are corresponding; Said feedback unit is when the said differential information of feedback; Also feed back the corresponding current channel information of said other data flow, said other data flow are at least one data flow except that confirming the differential information corresponding data flow.
10. the feedback device of channel information as claimed in claim 9; It is characterized in that; Said definite unit is at least one moment except that said at least one moment; Also confirm the corresponding current channel information of data flow of at least one, said feedback unit also feeds back said current channel information.
11. the feedback device like claim 9 or 10 described channel informations is characterized in that, when said definite unit specified data flows the channel information of current correspondence, according to the corresponding channel information of rule grouping specified data stream that is provided with in advance.
12. the feedback device of channel information as claimed in claim 11; It is characterized in that; When said definite unit flows corresponding channel information or differential information according to the rule grouping specified data that is provided with in advance; At odd number constantly, confirm the corresponding channel information or the differential information of a part of data flow of regulation; In even number constantly, confirm the corresponding channel information or the differential information of other a part of data flow of regulation.
13. the feedback device of channel information as claimed in claim 12; It is characterized in that; When said feedback unit feeds back said channel information or differential information; If at least two channel information or differential information that data flow is corresponding have been confirmed in said definite unit, then optionally feed back corresponding channel information or the differential information of at least one data flow wherein.
14. the feedback device of channel information as claimed in claim 13; It is characterized in that; When said feedback unit optionally feeds back corresponding channel information of wherein at least one data flow or differential information, according to corresponding channel information or the differential information of rule grouping feedback data stream that is provided with in advance.
15. the feedback device of channel information as claimed in claim 14; It is characterized in that; When said feedback unit flows corresponding channel information or differential information according to the rule grouping feedback data that is provided with in advance; At odd number constantly, the corresponding channel information or the differential information of a part of data flow of feedback regulation; In even number constantly, the corresponding channel information or the differential information of other a part of data flow of feedback regulation.
16. the feedback device like claim 9 or 10 described channel informations is characterized in that, also comprises: preserve the unit, be used to preserve the current channel information that said definite unit is confirmed.
17. the feedback device like claim 9 or 10 described channel informations is characterized in that, said feedback device is the terminal.
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| PCT/CN2009/071360 WO2009129731A1 (en) | 2008-04-22 | 2009-04-20 | A method and apparatus for feeding the channel information back |
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| CN103188031B (en) * | 2011-12-28 | 2016-02-17 | 同济大学 | Channel time domain correlation is utilized to reduce the code book coded message processing method of feedback quantity |
| CN106559165B (en) * | 2015-09-24 | 2020-11-06 | 华为技术有限公司 | Method and equipment for feeding back channel state information |
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| US8014455B2 (en) * | 2006-03-27 | 2011-09-06 | Qualcomm Incorporated | Feedback of differentially encoded channel state information for multiple-input multiple-output (MIMO) and subband scheduling in a wireless communication system |
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