CN101567762A - Feedback method and device of channel information - Google Patents
Feedback method and device of channel information Download PDFInfo
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- CN101567762A CN101567762A CNA2008100366506A CN200810036650A CN101567762A CN 101567762 A CN101567762 A CN 101567762A CN A2008100366506 A CNA2008100366506 A CN A2008100366506A CN 200810036650 A CN200810036650 A CN 200810036650A CN 101567762 A CN101567762 A CN 101567762A
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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
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 class technology, one class 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 maximum 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, OFDM is inserted (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, at last respectively by T transmitting antenna (M≤T) launch, promptly there is the data flow of M absolute coding modulation (to suppose that each antenna is independent mutually, M can be the quantity of transmitting antenna, M the independent beam that forms by a plurality of antennas, the M of Fa Songing absolute coding modulated data blocks simultaneously, as super broad band radio communication (UMB, 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, hereinafter unification is explained with " M data flow ", be reported to be independent data stream no longer specially, especially, for SCW, M=1).Similarly, 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 channel information of all data flow correspondences of feedback at MCW pattern feedback data.But the inventor is through finding after scrutinizing that the quantity of event data stream is more, and then Fan Kui channel information quantity 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, determine the differential information of the current channel information of at least one data flow correspondence with respect to the channel information in the previous moment; Feed back described differential information.
The embodiment of the invention provides a kind of feedback device of channel information, comprising: determining unit is used for determining the differential information of the current channel information of at least one data flow correspondence with respect to the channel information in the previous moment at least one constantly; Feedback unit is used to feed back the differential information that described determining unit is determined.
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 schematic diagram of the SCW of prior art;
Fig. 2 is the schematic diagram 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.Described method can comprise: at least one constantly, determine the differential information of the current channel information of at least one data flow correspondence with respect to the channel information in the previous moment; Feed back described differential information.The moment here can refer to Transmission Time Interval (TTI, Transmission Time Interval).When determining differential information, can also determine the current channel information of other data flow correspondences, when feeding back described differential information, can also feed back the current channel information of described other data flow correspondences, feed back the bit number that described differential information uses and be less than the bit number that feeds back described channel information.Other data flow here are at least one data flow except that determining the differential information corresponding data flow.
During the feedback differential information, can use 1 described differential information of bit feedback.If determined the current channel information of 1 data flow correspondence, then can use the channel information of the individual bit feedback all data streams of N+ (M-1) correspondence or the differential information of channel information, wherein, N is the bit number that the channel information of a data flow correspondence uses, and M is the quantity of all data streams.
During the feedback differential information, can use 2 described differential information of bit feedback.If determined the current channel information of 1 data flow correspondence, then can use the channel information or the differential information of all data flow correspondences of N+ (M-1) * 2 bit feedback, wherein, N is the bit number that the channel information of a data flow correspondence uses, and M is the quantity of all data streams.
During the feedback differential information, can use to be not less than log
2The described differential information of 3 a minimum positive integer bit feedback (for example comprising rising, the constant or information that descends).If determined the current channel information of 1 data flow correspondence, then used N+[(M-1) * log
23] channel information or the differential information of all data flow correspondences 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 channel information of a data flow correspondence uses, M is the quantity of all data streams.
Obviously, the current channel information of determining at least one data flow correspondence can be determined the differential information of the current channel information of whole data flow correspondences with respect to the channel information of previous TTI during with respect to the differential information of the channel information of previous TTI.
In addition,, the current channel information of at least one data flow correspondence can be determined, during feedback, described 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 the channel information of current correspondence or differential information, can optionally determine the channel information or the differential information of at least one data flow correspondence wherein.When optionally determining the channel information of at least one data flow correspondence wherein or differential information, can be according to corresponding channel information or the differential information of rule grouping specified data stream that sets in advance.When flowing corresponding channel information or differential information, can determine 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 sets in advance; In even number constantly, determine the channel information or the differential information of other a part of data flow correspondence of regulation.
For further reducing feedback quantity, when feedback channel information or differential information, can optionally feed back at 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 the channel information or the channel information difference of first, second data flow correspondence constantly at odd number, feeds back the channel information or the channel information difference of the 3rd, the 4th data flow correspondence 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, can only feed back the channel information or the differential information of one or more groups data flow correspondence wherein at every turn.Because feedback principle and mode and feedback all data streams are just the same, repeat no more here.
In actual applications, 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 introduced here.In the UMB2.0 agreement, the feedback of SCW and MCW is all classified as multi-input multi-ouput channel quality indication (MCQI, MIMO Channel Quality Indicator) feedback.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 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 in oppositely upward transmission of OFDMA Common Control Channel (R-ODCCH, Reverse OFDMA Dedicated ControlChannel).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 be because, the feedback model of MIMO can only be a kind of pattern among SCW or the MCW, and can know current MIMO pattern by top signaling between base station and the subscriber equipment, so 100,101 and 110 can't clash for multiplexing twice.
As can be seen from Table 3, when adopting the MCW feedback model, the needed load of R-ODCCH is maximum, with 101 and 110 is 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 101 in order to make the bit number of total load constant, also reduced one deck feedback, feedack is incomplete beyond doubt like this.Especially, SCW has considered the feedback of SFCH, 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, described method can comprise:
Step S301: at least one constantly, determine 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 determine quantizing, can determine the difference of the SINR after the quantification of a data flow, also can determine the difference of the SINR after the quantification of a plurality of data flow, determine 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 determine quantizing, can determine 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 determines to quantize.After determining the SINR after the current quantification, the SINR after the quantification of SINR after the current quantification and previous TTI can be compared, obtain difference.
During the difference of the SINR after determine quantizing, can also determine the SINR after the current quantification of other data flow.For example, suppose that the base station forms 4 data flow, then can determine wherein the SINR after the current quantification of 1 data flow, determine the difference of the SINR after other 3 data flowizations.
For further reducing feedback quantity, can also optionally feed back at 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, even number TTI feed back constantly the 3rd, the 4th after the data flow corresponding quantitative SINR or quantize after the SINR difference, 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 described 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, TTIj represents j TTI, j is a positive integer, and with 4 certain corresponding relation is arranged, such as being divided exactly by 4.
Table 4
By table 4 as seen, 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 only determine the SINR after the current quantification of 1 data flow wherein, 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 the base station forms 4 data flow, when SINR, other data flow after using the quantification of the data flow of 4 bit feedback among the 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
By table 5 as seen, 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, after even 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 channel of MCW correspondence, to include in the another one channel and continue the reservation 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 only determine the SINR after the current quantification of 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 using SINR, other data flow after the quantification of the data flow of 4 bit feedback among the MCW r-mqich then all to use 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
By table 6 as seen, 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 is at most by 22 bits (under the MCW pattern, 101 and 110 all need 22 bits) still reduce to 20 bits, 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 determine the SINR after the current quantification of 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 and the employed bit number of difference thereof are 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
23 a minimum positive integer bit feedback difference is when (for example comprising rising, the constant and information that descends), and 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
By table 7 as seen, 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 grouping feedback 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 for the first time, TTI is-5dB that TTI is-4.5dB for the third time, as shown in Table 10 for the second time, 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, from the angle of base station, this data flow the second time TTI correspondence the SINR value with respect to the first time TTI the SINR value rise, for the third time the SINR value of TTI with respect to the second time TTI the SINR value constant.
| Ctol mearange [dB) | CQI reported | Ctol meaassumed 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 carrier/interface ratio of current this terminal correspondence 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: determining unit 401, be used for determining the differential information of the current channel information of at least one data flow correspondence at least one constantly with respect to the channel information in the previous moment; Feedback unit 402 is used to feed back the differential information that described determining unit is determined.The moment here can refer to TTI.
When determining unit 401 is determined differential information, can also determine the current channel information of other data flow correspondences, feedback unit 402 is when the differential information that feedback determining unit 401 is determined, also feed back the current channel information of other data flow correspondences that determining unit 401 determines, described other data flow are at least one data flow of removing definite differential information corresponding data flow.
Determining unit 401 is also determined the current channel information of the data flow correspondence of at least one at least one moment except that described at least one moment, and feedback unit 402 also feeds back described current channel information.
When determining unit 401 specified datas flow the channel information of current correspondence or differential information, can optionally determine the channel information or the differential information of at least one data flow correspondence wherein.For example, suppose that there are 4 transmitting antennas the base station, can form 4 independent data streams, at this moment, determining unit 401 can only be determined the channel information or the differential information of 3 data flow correspondences wherein.When determining unit 401 is optionally determined the channel information of at least one data flow correspondence wherein or differential information, can be according to corresponding channel information or the differential information of rule grouping specified data stream that sets in advance.When determining unit 401 flows corresponding channel information or differential information according to the rule grouping specified data that sets in advance, can determine the channel information or the differential information of a part of data flow correspondence of regulation at odd number constantly; In even number constantly, determine the channel information or the differential information of other a part of data flow correspondence of regulation.
When feedback unit 402 described channel informations of feedback or differential information, if determining unit 401 has been determined the channel information or the differential information of at least two data flow correspondences, then feedback unit 402 optionally feeds back the channel information or the differential information of at least one data flow correspondence wherein.
For further reducing feedback quantity, channel massage or differential information that feedback unit 402 can also optionally be determined at 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, the channel information or the differential information of feedback unit 402 first, second data flow correspondences of feedback, at even number TTI constantly, the channel information or the differential information of the 3rd, the 4th data flow correspondence of feedback unit 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, if 401 of determining units are determined the wherein current channel information of 1 data flow, and the differential information of definite (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 401 current channel informations of determining 1 data flow of determining unit, and the differential information of definite (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 comprising rising, the constant and 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 determine the current channel information of 1 data flow, and the differential information of definite (M-1) individual data flow, then the employed bit number of MCW r-mqich feedback channel information or differential information is 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 back one determining unit 401 is determined differential information constantly.For example, suppose that determining unit 401 determined channel information constantly at first, at this moment, preserve unit 403 and can preserve this channel information constantly, second moment, determining unit 401 can be determined the channel information in second moment, and 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 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 of at least one data flow correspondence of feedback unit 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 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 as channel information adjustment next time.
It is to be noted, no matter adopt any differential feedback mode, the feedback of channel information integrity value still must send, its transmission can the cycle also can aperiodic, the length in transmission cycle or the opportunity of transmission can be decided in its sole discretion by base station decision or terminal, such as, terminal is realized feed back full channel information when the twice channel information difference in a certain data flow front and back is big, perhaps the base station is found that the channel information difference continuous several times feedback receive is made mistakes or need wipe the time, can be guided 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 stronger robustness.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement 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 finish by 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 improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (19)
1. a feedback method of channel information is characterized in that, comprising:
At at least one constantly, determine the differential information of the current channel information of at least one data flow correspondence with respect to the channel information in the previous moment;
Feed back described differential information.
2. feedback method of channel information as claimed in claim 1, it is characterized in that, when determining described differential information, also determine the current channel information of other data flow correspondences, when feeding back described differential information, also feed back the current channel information of described other data flow correspondences, described other data flow are at least one data flow except that determining the differential information corresponding data flow.
3. feedback method of channel information as claimed in claim 1 is characterized in that, also comprises:
In at least one moment except that described at least one moment, determine the current channel information of at least one data flow correspondence;
Feed back described current channel information.
4. as claim 2 or 3 described feedback method of channel information, it is characterized in that channel information or differential information that specified data flows current correspondence are specially: according to corresponding channel information or the differential information of rule grouping specified data stream that sets in advance.
5. feedback method of channel information as claimed in claim 4, it is characterized in that, specifically comprise according to corresponding channel information or the differential information of rule grouping specified data stream that sets in advance: at odd number constantly, determine the channel information or the differential information of a part of data flow correspondence of regulation; In even number constantly, determine the channel information or the differential information of other a part of data flow correspondence of regulation.
6. as claim 2 or 3 described feedback method of channel information, it is characterized in that, feeding back described channel information or differential information is specially: if determined the channel information or the differential information of at least two data flow correspondences, then optionally feed back the channel information or the differential information of at least one data flow correspondence wherein.
7. feedback method of channel information as claimed in claim 6, it is characterized in that optionally the channel information or the differential information of feedback at least one data flow correspondence wherein are specially: according to corresponding channel information or the differential information of rule grouping feedback data stream that sets in advance.
8. feedback method of channel information as claimed in claim 7, it is characterized in that, specifically comprise according to corresponding channel information or the differential information of rule grouping feedback data stream that sets in advance: at odd number constantly, the channel information or the differential information of a part of data flow correspondence of feedback regulation; In even number constantly, the channel information or the differential information of other a part of data flow correspondence of feedback regulation.
9. as any described feedback method of channel information of claim 1-3, it is characterized in that described channel information is SINR or the channel characteristic value after channel gain, Signal to Interference plus Noise Ratio SINR, the quantification.
10. the feedback device of a channel information is characterized in that, comprising:
Determining unit is used for determining the differential information of the current channel information of at least one data flow correspondence with respect to the channel information in the previous moment at least one constantly;
Feedback unit is used to feed back the differential information that described determining unit is determined.
11. the feedback device of channel information as claimed in claim 10, it is characterized in that, described determining unit is when determining described differential information, also determine the current channel information of other data flow correspondences, described feedback unit is when the described differential information of feedback, also feed back the current channel information of described other data flow correspondences, described other data flow are at least one data flow except that determining the differential information corresponding data flow.
12. the feedback device of channel information as claimed in claim 10, it is characterized in that, described determining unit is at least one moment except that described at least one moment, also determine the current channel information of the data flow correspondence of at least one, described feedback unit also feeds back described current channel information.
13. feedback device as claim 11 or 12 described channel informations, it is characterized in that, when described determining unit specified data flows the channel information of current correspondence or differential information, according to corresponding channel information or the differential information of rule grouping specified data stream that sets in advance.
14. the feedback device of channel information as claimed in claim 13, it is characterized in that, when described determining unit flows corresponding channel information or differential information according to the rule grouping specified data that sets in advance, at odd number constantly, determine the channel information or the differential information of a part of data flow correspondence of regulation; In even number constantly, determine the channel information or the differential information of other a part of data flow correspondence of regulation.
15. the feedback device of channel information as claimed in claim 14, it is characterized in that, when described feedback unit feeds back described channel information or differential information, if described determining unit has been determined the channel information or the differential information of at least two data flow correspondences, then optionally feed back the channel information or the differential information of at least one data flow correspondence wherein.
16. the feedback device of channel information as claimed in claim 15, it is characterized in that, when described feedback unit optionally feeds back the channel information of at least one data flow correspondence wherein or differential information, according to corresponding channel information or the differential information of rule grouping feedback data stream that sets in advance.
17. the feedback device of channel information as claimed in claim 16, it is characterized in that, when described feedback unit flows corresponding channel information or differential information according to the rule grouping feedback data that sets in advance, at odd number constantly, the channel information or the differential information of a part of data flow correspondence of feedback regulation; In even number constantly, the channel information or the differential information of other a part of data flow correspondence of feedback regulation.
18. the feedback device as claim 11 or 12 described channel informations is characterized in that, also comprises: preserve the unit, be used to preserve the current channel information that described determining unit is determined.
19. the feedback device as claim 10,11 or 12 described channel informations is characterized in that, described feedback device is a terminal.
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| CN200810036650A CN101567762B (en) | 2008-04-22 | 2008-04-22 | Feedback method and device of channel information |
| 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702632A (en) * | 2009-10-29 | 2010-05-05 | 中兴通讯股份有限公司 | Periodic channel state information feedback method and system |
| CN103188031A (en) * | 2011-12-28 | 2013-07-03 | 同济大学 | Codebook coded message processing method for reducing feedback quantity through channel time domain relativity |
| CN106559165A (en) * | 2015-09-24 | 2017-04-05 | 华为技术有限公司 | A kind of method and apparatus of feeding back channel state information |
| WO2018201910A1 (en) * | 2017-05-04 | 2018-11-08 | 株式会社Ntt都科摩 | Beam information feedback method and user apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1996811A (en) * | 2005-12-31 | 2007-07-11 | 北京三星通信技术研究有限公司 | Realization method and device of the measurement report for determining transfer mode conversion |
| 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 |
| KR101322385B1 (en) * | 2006-10-09 | 2013-10-29 | 삼성전자주식회사 | Method and apparatus for feedback information in multiple input multiple output system |
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2008
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702632A (en) * | 2009-10-29 | 2010-05-05 | 中兴通讯股份有限公司 | Periodic channel state information feedback method and system |
| WO2010145592A1 (en) * | 2009-10-29 | 2010-12-23 | 中兴通讯股份有限公司 | Method and system for feeding back periodic channel status information |
| CN101702632B (en) * | 2009-10-29 | 2014-07-02 | 中兴通讯股份有限公司 | Periodic channel state information feedback method and system |
| CN103188031A (en) * | 2011-12-28 | 2013-07-03 | 同济大学 | Codebook coded message processing method for reducing feedback quantity through channel time domain relativity |
| 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 |
| CN106559165A (en) * | 2015-09-24 | 2017-04-05 | 华为技术有限公司 | A kind of method and apparatus of feeding back channel state information |
| WO2018201910A1 (en) * | 2017-05-04 | 2018-11-08 | 株式会社Ntt都科摩 | Beam information feedback method and user apparatus |
| US10763938B2 (en) | 2017-05-04 | 2020-09-01 | Ntt Docomo, Inc. | Beam information feedback method and user apparatus |
Also Published As
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| CN101567762B (en) | 2012-10-17 |
| WO2009129731A1 (en) | 2009-10-29 |
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