CN102271028B - Method and device for feeding back channel state information - Google Patents
Method and device for feeding back channel state information Download PDFInfo
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- CN102271028B CN102271028B CN201110221246.8A CN201110221246A CN102271028B CN 102271028 B CN102271028 B CN 102271028B CN 201110221246 A CN201110221246 A CN 201110221246A CN 102271028 B CN102271028 B CN 102271028B
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Abstract
The invention discloses a method and device for feeding back channel state information. The method comprises: a terminal determines the channel state information including N pieces of PMI (precoding matrix indicator) information on system bandwidths by using a pilot signal, and the terminal feeds back the channel state information, wherein the system bandwidths are S subband sets configured by a high level, and N is an integer more than 1 but smaller than S. Through the invention, the performance of the communication system is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of channel state information feedback method and device.
Background technology
In wireless communication system, transmitting terminal and receiving terminal take the mode of spatial reuse higher to obtain using many antennas
Speed.Relative to general method for spacial multiplex, a kind of enhanced technology is that receiving terminal feeds back to transmitting terminal channel information, is sent out
Sending end can be greatly enhanced transmission performance according to the channel information for obtaining using transmitting precoding technique.It is many for single user
Input multi output (Single User Multi-Input Multi-Output, referred to as SU-MIMO), it is directly special using channel
Levying Vector Message carries out precoding；For multiuser MIMO (Multiple User Multi-Input Multi-Output, letter
Referred to as MU-MIMO), need more accurately channel information to instruct multi-user pre-coding.
In the standard of Long Term Evolution (Long Term Evolution, referred to as LTE), the minimum feedback of channel information
Unit is subband (Subband), and a subband is made up of several Resource Block (Resource Block, referred to as RB), each
RB is made up of multiple Resource Units (Resource Element, referred to as RE)；RE is the least unit of running time-frequency resource in LTE.
During UE feedback channel informations, corresponding object can be subband (Multi-Subband), or multiple subbands, and broadband
(Wideband).The third generation affiliate that is defined on of the concrete granularity of RB, subband (Subband) and broadband (Wideband) counts
There is clearly regulation in drawing (3rd Generation Partnership Project, referred to as 3GPP) agreement 36.213.
There is various transmission modes and feedback model in LTE system, several main transmission modes are as follows：
Pattern 1：Single antenna port：0 (Single-antenna port of port：port 0).
Pattern 2：Transmitting diversity (Transmit diversity).
Pattern 3：Open-Loop Spatial Multiplexing (Open-loop spatial multiplexing).
Pattern 4：Closed-Loop Spatial Multiplexing (Closed-loop spatial multiplexing).
Pattern 5：Multi-user's multiple-input and multiple-output (Multi-user MIMO).
Pattern 6：Closed loop Rank=1 precoding (Closed-loop Rank=1precoding).
Mode 7：Single current beamforming：5 (Single-antenna port of port：port 5).
There are different feedback models and feedback content, in LTE system, Closed-Loop Spatial Multiplexing under different transmission modes
Feedback model and feedback method under transmission mode.It is multiple that feedback method and content under other transmission modes is generally closed loop space
The simplification of transmission mode.
During spatial reuse, the feedback content of uplink channel information mainly has three kinds：
(1) pre-coding matrix instruction (Precoding Matrix Indicator, referred to as PMI), characteristic feature vector
Information, recommends base station, for downlink precoding technology.
Wherein, eight antennas advanced long-term evolution system (Long-Term Evolution Advance, referred to as
LTE-A) in system, PMI includes first kind precoding designator i1 and Equations of The Second Kind precoding designator i2.I1 and i2 is two ropes
Drawing value, a code word being indicated collectively by the two indexes, the code word of instruction is used to characterize channel characteristics Vector Message；At four days
In the lte-a system of line, PMI includes single PMI, and indexes of the single PMI for certain code word in code book, the code word of instruction are used for table
Reference road characteristic vector information.
(2) order instruction (Rank Indication, referred to as RI) information, characterizes the order of channel, and base station is used as descending support
The number of plies.It is maximum during LTE to support RI=4.
(3) channel quality indicates (Channel Quality Indicator, referred to as CQI) information, characterizes the matter of channel
Amount information, characterizes channel quality with the modulation coding mode of recommendation, and the modulation coding mode of more high-order represents that performance is better,
Support 16 kinds of CQI hierarchical selections in LTE altogether.
Above-mentioned channel information PMI/RI/CQI is divided into following two in up feedback kind：Periodic feedback, it is main to carry
Feedback or non-periodic feedback on ascending control channel PUCCH, the feedback being carried on Uplink Shared Channel PUSCH.
Periodic feedback is that system must be configured, and non-periodic feedback is the feedback of irregular flip-over type, non-on PUSCH
Periodic feedback, is a kind of higher feedback of precision, belongs to auxiliary, for putting forward high-precision feedback.
1 aperiodic feedback model table of table
Wherein, in table 3 in pattern x-y, x represents the feedback of CQI, 1 for broadband CQI feedback, 2 is subband CQI feedback, 3
For the CQI feedback of high-rise configuration.
Y represents that PMI feeds back, and 0 is that, without PMI, 1 is single PMI, and 2 is multiple PMI.
Closed-Loop Spatial Multiplexing always supports the feedback of PMI, so the feedback model on the PUSCH of its support is：
Modes1-2,2-2,3-1.
Modes 1-2：For each Subband, 1 PMI is all fed back；CQI is fed back for whole bandwidth.
Modes 2-2：One broadband CQI of feedback, and a broadband PMI；The positional information of the preferably subband of feedback M；M
Joint CQI of subband；Joint PMI of M subband.
Modes 3-1：In S subband of bandwidth range of high-rise configuration；Feed back the joint of above-mentioned S subband of bandwidth range
CQI and joint PMI；Feed back the single CQI of each subband.
In actual feedback, RI also with above-mentioned CQI information and PMI information same PUSCH subframe internal feedback.
RI is restricted to a numerical value in the range of 1～N, and N=min (Nt, Nr) Nt represents transmitting antenna number, and Nr represents reception antenna
Number.
The feedback of CQI is broadly divided into subband CQI and broadband CQI, that is, joint CQI of multiple subbands in implication.Its
Implication assumes that the descending CQI grades for using a subband transmission support are descending with hypothesis respectively and uses multiple subbands to pass jointly
The CQI grades that delivery of energy is supported.
It can be 1 or 2 otherwise for the CQI of same resource units.It is mainly relevant with RI, it is 1 CQI during RI=1,
RI is 2 CQI when being more than 1.It is 4bit during 1 CQI, during 2 CQI of feedback, the 2nd CQI uses differential technique, based on the 1st
CQI difference, is 3bit.It is 11bit to the maximum, the maximum supported expense of CSI information when this is also feedback on PUCCH.
CQI is an index for weighing down channel quality quality.In 3GPP 36-213 agreements CQI with 0～15 it is whole
Representing, represent different CQI grades respectively, different CQI correspond to respective modulation system and encoder bit rate to numerical value
(MCS)。
RI is used for the number for describing space independent channel, the order of respective channels response matrix.Open-Loop Spatial Multiplexing and closing
Under annular space multiplexer mode, UE feedback RI information is needed, RI information under other patterns, need not be fed back.
PMI refers to the call number of the precoding codebook of UE feedbacks.Closed-Loop Spatial Multiplexing, MU-MIMO, RI=1 closed loop this 3
Under the pattern of kind, need to feed back PMI information, under other emission modes, do not feed back PMI information.
Specifically, the cqi definition for occurring in LTE is various, according to different principles, can divide CQI：
Broadband CQI (wideband CQI) and subband CQI (subband CQI) are divided into according to Measurement bandwidth.
Wideband CQI refer to that the channel status to all of subband indicates that what is obtained is the CQI of subband set S
Information；
Subband CQI refer to the CQI information for each subband.LTE according to different system bandwidths, by effective bandwidth
Corresponding RB divide into several RB groups, and each RB group is referred to as subband (subband).
Subband CQI can be divided into full subband CQI and Best M CQI again：Full subband CQI report all
The CQI information of subband；Best M CQI are that M subband is selected from sets of subbands S, report the CQI information of this M subband, and
The positional information of M subband is reported simultaneously.
Single current CQI and double fluid CQI are divided into according to code stream number.
Single current CQI：It is applied to single-antenna transmission port 0, port 5, transmitting diversity, the closed loop sky of MU-MIMO, RI=1
Between be multiplexed, now UE reports the CQI information of single code stream；Double-current CQI：It is applied to Closed-Loop Spatial Multiplexing pattern.It is empty for open loop
Between multiplexer mode, as channel condition information is unknown, and equilibrium treatment has been carried out to double-current channel information in precoding, therefore
Under Open-Loop Spatial Multiplexing, the CQI of 2 code streams is equal.
Absolute value CQI and differential CQI (Differential CQI) are divided into according to CQI method for expressing.
The CQI indexes (CQI index) that absolute value CQI is represented with 4bit；Differential CQI (Differential CQI) is used
The CQI index that 2bit or 3bit are represented；Differential CQI be divided into again the 2nd code stream relative to the 1st code stream differential CQI,
Subband CQI relative to subband CQI differential CQI and suband CQI relative to broadband CQI differential CQI.
It is divided into wideband CQI, UE selected (subband CQI), high-rise configuration according to CQI reporting schemes
(High layer configured)(subband CQI).Wherein, wideband CQI refer to the CQI letters of subband set S
Breath；UE selected (subband CQI) i.e. Best M CQI, feed back the CQI information of selected M subband, while reporting
The position of M subband；The i.e. full subband CQI of High layer configured (subband CQI), for each height
Band one CQI information of feedback.
High layer configured and UE selected are the feedback systems of subband CQI, in non-periodic feedback
Under pattern, the subband cause not of uniform size of both feedback system definition；Under UE selected patterns, the big of M is also defined
It is little.In LTE system, the feedback of CQI/PMI, RI can periodically be fed back, or acyclic feedback, specifically
Feedback is as shown in table 2：
2 periodic feedback of table and aperiodicity feed back corresponding uplink physical channel
| Scheduling method | Periodicity CQI channel | Aperiodicity CQI channel |
| Frequency non-selective | PUCCH | |
| Frequency selectivity | PUCCH | PUSCH |
In lte-a system, eight antenna technologies are employed, also use code book enhancement techniques accordingly, its core is, sharp
Indexed with two precoding matrix indicators information, namely the first precoding designator index i1 and the second precoding designator
I2, to represent jointly a pre-coding matrix.Briefly, the expense of the feedback increase PMI feedbacks with respect to LTE, and utilize two
The common status information for representing channel of feedback of individual PMI information.
Therefore, in LTE-A, in supporting the broadband/many sub-band channel information for need under the transmission mode of SU/MU feedback,
The channel information of transmission may be needed to have RI, PMI and CQI, wherein PMI information has potentially included i1 and i2.
Multi-antenna technology has been widely used in lte-a system at present, and thing followed multiple antennas calibration problem is also drawn
Extensive concern is played.Antenna calibration problem refers in multi-antenna systems, there is regular hour delay between each antenna
And phase error.
The change of the channel condition brought by the error between antenna will have a strong impact on the selection of PMI, and correlation technique
The PMI ratios of precision of middle feedback are relatively low, cause the inaccurate performance so as to reduce whole communication system of result of antenna calibration.
The content of the invention
Present invention is primarily targeted at a kind of channel state information feedback method and device are provided, it is above-mentioned at least to solve
Due to the relatively low result for causing antenna calibration of the ratio of precision of feeding back channel state information it is inaccurate, so as to cause systematic function to decline
Problem.
According to an aspect of the invention, there is provided a kind of channel state information feedback method, including：Terminal uses pilot tone
Signal determines the channel condition information of N number of joint PMI included in system bandwidth；Terminal feedback letter on PUSCH or PUCCH
Channel state information.Wherein, system bandwidth (Wideband) is S sets of subbands of high-rise configuration, and N is more than 1 and whole less than S
Number.
Preferably, in eight antenna systems, PMI information includes that the first precoding designator index i1 and the second precoding refer to
Show symbol index i2, in four antenna systems, PMI information is list PMI.
Preferably, terminal feedback channel condition information includes：Terminal is according to one of following feedback model fed-back channel status
Information：
Feedback broadband CQI, broadband PMI, N number of joint PMI in system bandwidth in the CQI of each subband, system bandwidth and
Broadband order designator information RI；
The CQI of each subband, the N number of joint in system bandwidth in feedback broadband CQI, broadband i1, broadband i2, system bandwidth
I2 and broadband RI；
N number of joint in feedback broadband CQI, broadband i1, broadband i2, system bandwidth in the CQI of each subband, system bandwidth
I1, N number of joint i2 and broadband RI.
Preferably, broadband CQI includes one below and combinations thereof：Absolute broadband CQI, differential broadband CQI.
Preferably, each subband CQI in system bandwidth includes one below and combinations thereof：Absolute subband CQI, difference subspace
Band CQI.
Preferably, the value of N is fixed more than 1 and less than the integer value of S, or transformable is more than 1 and whole less than S
Numerical value.
Preferably, channel condition information is comprising CQI (CQI) information, order designator (RI) information and prelists
Code designator (PMI) information.
According to a further aspect in the invention, there is provided a kind of information feedback device, including：Determining module, uses
In the channel condition information that the N number of joint PMI information included in system bandwidth is determined using pilot signal；First feedback mould
Block, for the feeding back channel state information on PUSCH or PUCCH；Wherein, system bandwidth (Wideband) is the S of high-rise configuration
Individual sets of subbands, N are more than 1 and less than the integer of S.
Preferably, feedback module is for according to one of following feedback model feeding back channel state information：
In four antenna systems, in feedback broadband CQI, broadband PMI, system bandwidth in the CQI of each subband, system bandwidth
N number of joint PMI and broadband order designator information RI；
In eight antenna systems, the CQI of each subband in broadband CQI, broadband i1, broadband i2, system bandwidth, system are fed back
N number of joint i2 and broadband RI in bandwidth；
In eight antenna systems, the CQI of each subband, system in broadband CQI, broadband i1, broadband i2, system bandwidth are fed back
N number of joint i1, N number of joint i2 and broadband RI in bandwidth；
It is N number of in the CQI of each subband, system bandwidth in feedback broadband CQI, broadband i1 and broadband i2, system bandwidth
Joint RI in N number of joint i2, broadband RI and system bandwidth in conjunction i1, system bandwidth.
Preferably, the value of N is fixed more than 1 and less than the integer value of S, or transformable is more than 1 and whole less than S
Numerical value.
Preferably, channel condition information is comprising CQI (CQI) information, order designator (RI) information and prelists
Code designator (PMI) information.
By the present invention, the channel of N number of joint PMI included in system bandwidth is determined using terminal using pilot signal
Status information；Terminal feeds back the channel condition information on PUSCH or PUCCH.Wherein, system bandwidth (Wideband) is height
S sets of subbands of layer configuration, N is that, more than 1 and less than the integer of S, the ratio of precision for solving feeding back channel state information is relatively low
Cause the result of antenna calibration inaccurate, so as to the problem for causing systematic function to decline, and then reach raising systematic function
Effect.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of channel state information feedback method according to embodiments of the present invention；And
Fig. 2 is the structured flowchart of information feedback device according to embodiments of the present invention.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing the present invention in detail.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
A kind of channel state information feedback method is present embodiments provided, Fig. 1 is channel shape according to embodiments of the present invention
The flow chart of state information feedback method, as shown in figure 1, the method includes steps S102 and step S104.
Step S102：Terminal determines the N number of joint PMI letter included in system bandwidth (Wideband) using pilot signal
The channel condition information of breath.
Step S104：Terminal feeds back the channel condition information on PUSCH or PUCCH.
Wherein, system bandwidth (Wideband) is S sets of subbands of high-rise configuration, and N is more than 1 and less than the integer of S.
By above-mentioned steps, terminal determines channel condition information by pilot signal, and the channel condition information includes and is
N number of joint PMI on regiment commander's width, and the channel condition information is fed back on PUSCH and PUCCH, overcome related skill
In art, channel information feedback method feedback accuracy is than relatively low problem, so as to improve the accuracy of feedback information, so as to improve
Communication system performance.In the present embodiment, the channel condition information only to carrying N number of joint PMI in system bandwidth enters
Row feedback, does not carry out PMI feedbacks respectively to whole subbands, reduces the feedback overhead of system to a certain extent.
It should be noted that S subband carries out the system broad in the resource granularity in resource division with system
(wideband) implication is identical, wherein, the system broad refers to resource granularity.
Preferably, in eight antenna systems, joint PMI includes i1 and i2, and in four antenna systems, joint PMI is
Single PMI.
For the feedback that channel condition information is carried out on PUSCH or on PUCCH can have various methods, as PMI exists
The content that four antenna systems are included with eight antenna systems is different, single PMI of four antenna systems can be fed back, it is also possible to right
The i1 and i2 that PMI includes in eight antenna systems is fed back, and in eight antenna systems in PMI feedback procedures, can select feedback
I1, it is also possible to feed back i2.
When implementing, for S subband of high-rise configuration, namely system bandwidth, can be in one of following four kinds of modes of employing
The channel condition information is fed back on PUSCH or PUCCH.
Mode one：It is N number of in the CQI of each subband, system bandwidth in feedback broadband CQI, broadband PMI, system bandwidth
Close PMI and broadband order designator information RI；
Mode two：Feedback broadband CQI, broadband the first precoding designator index i1 and broadband the second precoding designator rope
Draw the CQI of each subband in i2, system bandwidth, the second precoding of the N number of joint designator index i2 and broadband in system bandwidth
RI；
Mode three：The CQI of each subband in feedback broadband CQI, broadband i1, broadband i2, system bandwidth, in system bandwidth
The first precoding designator of N number of joint index i1 and the second precoding of N number of joint designator index i2 and broadband RI；
In above-mentioned feedback model, while CQI feedback precision is taken into account, N number of joint PMI in system bandwidth is increased
Feedback information, improve feedback accuracy, and be that the method for each subband feedback PMI information is improved to simple extension,
The excessive problem of feedback overhead is considered, so as to improve the performance of system.
In above-mentioned preferred implementation, subband CQI and broadband CQI can be fed back in the form of differential CQI.Make
Reduced for transmitting the overhead bit of CQI with differential broadband CQI.
Specifically, the differential CQI of broadband CQI can be based on the differential CQI between streams of code words.Preferably, work as code word
When stream number is more than 1, the broadband CQI of other streams of code words can be the differential CQI of the broadband CQI based on first streams of code words.
Specifically, subband CQI can be based on the differential CQI between streams of code words；Or subband CQI can be based on broadband
The differential CQI of CQI；Preferably, when streams of code words number is more than 1, the subband CQI of other streams of code words can be based on first code
The differential CQI of the subband CQI of word stream；Preferably, the subband CQI in each streams of code words can be based on the width on same code word stream
Differential CQI with CQI.
Preferably, the value of N needs to have following manner according to system：
Mode one：N can be more than 1 and less than the fixed integer of S.Preferably, fixed integer N values can be according to system
Demand is configured or empirical value is defined as fixed integer.Preferably, fixed integer N can be 2,3,4 etc..Preferably, when N is 2
When, can be with the PMI value of first half subband in feedback system bandwidth and the PMI value of latter half subband, or feedback is in system
The PMI value of the PMI value with alleviating distention in middle-JIAO channel quality best one subband and a worst subband, or feedback is in system bandwidth
The PMI value of S/2 poor subband of channel quality in the PMI value and system bandwidth of the preferable S/2 subband of middle channel quality；
Mode two：N can be more than 1 and less than the transformable integer of S.
Preferably, N values can one of as follows be selected：
Base station can determine the value of the N according to the configuration of system, and the value of the N is sent to terminal.
Base station can determine the value of N according to channel condition；Or, base station can be determined according to the size postponed between antenna
The value of N；Or, base station can determine the N values according to the instruction of upper strata instruction；Or, terminal is to base station feedback channel status
Feed back the value of N during information simultaneously；
Terminal can confirm the value of N according to the situation of channel quality conditions, and to base station feedback.
In another embodiment, a kind of information feedback software is additionally provided, the software is used to perform
State the technical scheme described in embodiment and preferred embodiment.
In another embodiment, a kind of storage medium is additionally provided, the above-mentioned data that are stored with the storage medium are passed
Defeated software, the storage medium are included but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
The embodiment of the present invention additionally provides a kind of information feedback device, and the information feedback device can
For realizing above-mentioned channel state information feedback method and preferred implementation, explanation was carried out, had been repeated no more, under
The module being related in the information feedback device is illustrated.As used below, term " module " can
To realize the combination of the software and/or hardware of predetermined function.Although the system and method described by following examples preferably with
Software is realizing, but hardware, or the realization of the combination of software and hardware is also what is may and be contemplated.
Fig. 2 is the structured flowchart of information feedback device according to embodiments of the present invention, as shown in Fig. 2 the dress
Put including：Determining module 22 and feedback module 24, are described in detail to said structure below.
Determining module 22, determines the channel of N number of joint PMI included in system bandwidth for terminal using pilot signal
Status information；Feedback module 24, is connected to determining module 22, for feeding back what determining module 22 determined on PUSCH or PUCCH
Channel condition information；Wherein, system bandwidth (Wideband) is S sets of subbands of high-rise configuration, and N is more than 1 and less than S's
Integer.
Preferably, feedback module 24 for according to one of following feedback model on PUSCH or PUCCH fed-back channel status
Information：
In four antenna systems, in feedback broadband CQI, broadband PMI, system bandwidth in the CQI of each subband, system bandwidth
N number of joint PMI and broadband RI；
In eight antenna systems, the CQI of each subband in broadband CQI, broadband i1, broadband i2, system bandwidth, system are fed back
N number of joint i2 and broadband RI in bandwidth；
In eight antenna systems, the CQI of each subband, system in broadband CQI, broadband i1, broadband i2, system bandwidth are fed back
N number of joint i1, N number of joint i2 and broadband RI in bandwidth.
Preferably, subband CQI and broadband CQI can be fed back in the form of differential CQI.
Specifically, the differential CQI of broadband CQI can be based on the differential CQI between streams of code words.Preferably, work as streams of code words
When number is more than 1, the broadband CQI of other streams of code words can be the differential CQI of the broadband CQI based on first streams of code words；
Specifically, subband CQI can be based on the differential CQI between streams of code words；Or subband CQI can be based on broadband
The differential CQI of CQI；Preferably, when streams of code words number is more than 1, the subband CQI of other streams of code words can be based on first code
The differential CQI of the subband CQI of word stream；Preferably, the subband CQI in each streams of code words can be based on the width on same code word stream
Differential CQI with CQI；
Wherein, with regard to the value of N, there are as below methods：
N can be more than 1 and less than the fixed integer of S.Preferably, fixed integer N values can be matched somebody with somebody according to system requirements
Put or empirical value is defined as fixed integer.
Preferably, fixed integer N can be 2,3,4 etc..
Preferably, for example：When N is 2, N values can one of be as follows selected：
Method one：Can be with the PMI value of first half subband in feedback system bandwidth and the PMI value of latter half subband；
Method two：The feedback PMI value of best one subband of channel quality and worst subband in system bandwidth
PMI value；
Method three：Feedback channel in the PMI value and system bandwidth of the preferable S/2 subband of channel quality in system bandwidth
The PMI value of S/2 second-rate subband.
Or, N can be more than 1 and less than the transformable integer of S.Preferably, can one of as follows choosing
Select N values：
Method one：Base station can determine the value of the N according to the configuration of system, and the value of the N is sent to terminal；
Method two：Terminal can confirm the value of N according to the situation of channel quality conditions, and to base station feedback；
Method three：Base station can determine the value of N according to the size postponed between antenna；
Method four：Base station can determine the N values according to the instruction of upper strata instruction；
Method five：Terminal is to the value that N is fed back during base station feedback channel condition information simultaneously.
Illustrate below in conjunction with preferred embodiment, preferred embodiment below combines above-described embodiment and is preferable to carry out
Mode.
Preferred embodiment one
A kind of feedback method of channel condition information is present embodiments provided, the method comprises the steps：
Step S402：UE determines channel CQI, PMI and RI according to channel information.Wherein, the PMI information can include first
Precoding matrix indicators (i1) and the second precoding matrix indicators (i2).
Step S404：UE is on PUSCH to base station reporting status information of channel.
Wherein, channel condition information includes PMI information, CQI information and RI information；
Wherein, in four antenna systems, PMI information includes single PMI；In eight antenna systems, PMI information includes i1 and i2；
Specifically, in step S404 U E according to one of following feedback on reservation method physically row shared channel (PUSCH)
On to base station feedback channel condition information.
Feedback broadband CQI, broadband PMI, N number of joint PMI in system bandwidth in the CQI of each subband, system bandwidth and
Broadband order designator information RI；
Feedback broadband CQI, broadband the first precoding designator index (i1) and broadband the second precoding designator index
(i2), in system bandwidth each subband CQI, the second precoding of N number of joint designator index (i2) in system bandwidth and wide
Band RI；
Feedback broadband CQI, broadband the first precoding designator index i1 and broadband the second precoding designator index i2, are
The CQI of wide upper each subband of regiment commander, the first precoding of N number of joint designator index (i1) in system bandwidth and N number of combines the
Two precoding designators index (i2) and broadband RI；
Wherein, system bandwidth, namely broadband (Wideband), is S sets of subbands of high-rise configuration.
Wherein, N is fixed integer.
Preferably, N can be floor (S/M) or ceil (S/M)；Wherein M is more than 1 and less than the integer of S；Wherein,
Floor represents that ceil is represented and rounded up；Or, N can be fixed more than 1 and less than the integer of S；It is preferred that
Ground, N can be more than 1 and less than the integer of S for one, and such as 2,3 etc.；Especially, when N is 2, can be with feedback system bandwidth
The PMI value of the PMI value and latter half subband of first half subband, or feedback in system bandwidth, channel quality is best one
The PMI value of the PMI value of individual subband and a worst subband, or feedback is the preferable S/2 of channel quality in system bandwidth
The PMI value of S/2 poor subband of channel quality in the PMI value and system bandwidth of subband.
Preferably, subband CQI and broadband CQI can be fed back in the form of differential CQI.
Specifically, the differential CQI of broadband CQI can be based on the differential CQI between streams of code words.Preferably, work as streams of code words
When number is more than 1, the broadband CQI of other streams of code words can be the differential CQI of the broadband CQI based on first streams of code words.
Specifically, subband CQI can be based on the differential CQI between streams of code words；Or subband CQI can be based on broadband
The differential CQI of CQI；Preferably, when streams of code words number is more than 1, the subband CQI of other streams of code words can be based on first code
The differential CQI of the subband CQI of word stream；Preferably, the subband CQI in each streams of code words can be based on the width on same code word stream
Differential CQI with CQI.
Preferred embodiment two
A kind of feedback method of channel condition information is present embodiments provided, the method comprises the steps：
Step S502, UE determine channel quality indication (CQI) information (CQI), precoding matrix indicators information according to channel information
And order designator information (RI) (PMI).Wherein, PMI information can prelist including the first precoding matrix indicators i1 and second
Code Matrix Indicator i2.
Step S504, UE is to base station reporting status information of channel.
Wherein, channel condition information includes PMI information, CQI information and RI information；
Wherein, in four antenna systems, PMI information includes single PMI；In eight antenna systems, PMI information includes i1 and i2；
Specifically, in step S404 U E according to one of following feedback on reservation method physically row shared channel (PUSCH)
On to base station feedback channel condition information.
Feedback broadband CQI, broadband PMI, N number of joint PMI in system bandwidth in the CQI of each subband, system bandwidth and
Broadband order designator information RI；
Feedback broadband CQI, broadband the first precoding designator index i1 and broadband the second precoding designator index i2, are
The CQI of wide upper each subband of regiment commander, the second precoding of the N number of joint designator index i2 and broadband RI in system bandwidth；
Feedback broadband CQI, broadband the first precoding designator index i1 and broadband the second precoding designator index i2, are
The CQI of wide upper each subband of regiment commander, the first precoding of the N number of joint designator index i1 and N number of joint second in system bandwidth
Precoding designator indexes i2 and broadband RI；
Wherein, system bandwidth, namely broadband (Wideband), are S sets of subbands of high-rise configuration.
Wherein, N is more than 1 and less than the transformable integer of S.
Preferably, N values can one of as follows be selected：
Base station can determine the value of the N according to the configuration of system, and the value of the N is sent to terminal；
Base station can determine the value of N according to channel condition；Or, base station can be determined according to the size postponed between antenna
The value of N；Or, base station can determine the N values according to the instruction of upper strata instruction；Or, terminal is to base station feedback channel status
Feed back the value of N during information simultaneously；
Terminal can confirm the value of N according to the situation of channel quality conditions, and to base station feedback.
Preferably, subband CQI and broadband CQI can be fed back in the form of differential CQI.
Specifically, the differential CQI of broadband CQI can be based on the differential CQI between streams of code words.Preferably, work as streams of code words
When number is more than 1, the broadband CQI of other streams of code words can be the differential CQI of the broadband CQI based on first streams of code words.
Specifically, subband CQI can be based on the differential CQI between streams of code words；Or subband CQI can be based on broadband
The differential CQI of CQI；Preferably, when streams of code words number is more than 1, the subband CQI of other streams of code words can be based on first code
The differential CQI of the subband CQI of word stream；Preferably, the subband CQI in each streams of code words can be based on the width on same code word stream
Differential CQI with CQI.
By above-described embodiment, there is provided a kind of channel state information feedback method and device, pilot signal can be passed through
Determine channel condition information, the channel condition information includes but is not limited to the N number of PMI in system bandwidth, and by the channel status
Information is fed back on PUSCH and PUCCH, and in overcoming correlation technique, channel information feedback method feedback accuracy is than relatively low
(in the feedback model 3-1 and feedback model 1-2 that are supported in Closed-Loop Spatial Multiplexing system, all there is feedback accuracy not in problem
Enough problems.Broadband PMI is fed back such as in feedback model 3-1 only.If being changed to feedback model 1-2, although PMI feedback accuracies are obtained
To lifting, but CQI only has broadband feedback, still there is feedback accuracy), so as to improve the result of antenna calibration
Accuracy, so as to improve communication system performance.And the channel condition information only to carrying the N number of PMI in system bandwidth enters
Row feedback, does not feed back to the PMI of whole subbands, reduces the feedback overhead of system to a certain extent.Need
Bright, these technique effects are not that above-mentioned all of embodiment has, and some have the technical effect that some preferred realities
What the mode of applying could be obtained.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned present invention can be with general
Computing device realizing, they can be concentrated on single computing device, or are distributed in multiple computing devices and are constituted
Network on, alternatively, they can be realized with the executable program code of computing device, such that it is able to be stored in
By computing device performing in storage device, or they are fabricated to each integrated circuit modules respectively, or by them
Multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hard
Part and software are combined.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. a kind of channel state information feedback method, it is characterised in that comprise the steps：
Terminal determines that using pilot signal the N number of joint precoding designator included in system bandwidth indexes the letter of PMI information
Channel state information；
Channel condition information described in the terminal feedback；
Wherein, the system bandwidth is S sets of subbands of high-rise configuration, and N is more than 1 and less than the integer of S.
2. method according to claim 1, it is characterised in that in eight antenna systems, the PMI information includes that first is pre-
Coded indicator indexes i1 and the second precoding designator index i2, and in four antenna systems, the PMI information is list PMI.
3. method according to claim 2, it is characterised in that channel condition information described in the terminal feedback includes：
The terminal feeds back the channel condition information according to one of following feedback model：
N number of joint in feedback broadband CQI, broadband PMI, the system bandwidth in the CQI of each subband, the system bandwidth
PMI and broadband order designator information RI；
The CQI of each subband in the broadband CQI, broadband i1, broadband i2, the system bandwidth is fed back, in the system bandwidth
N number of joint i2 and the broadband RI；
Feed back the CQI of each subband, the system in the broadband CQI, the broadband i1, the broadband i2, the system bandwidth
N number of joint i1, N number of joint i2 and the broadband RI on regiment commander's width.
4. method according to claim 3, it is characterised in that the broadband CQI includes one below and combinations thereof：Definitely
Broadband CQI, differential broadband CQI.
5. method according to claim 3, it is characterised in that each subband CQI in the system bandwidth includes following
One of and combinations thereof：Definitely subband CQI, difference subspace band CQI.
6. method according to any one of claim 1 to 5, it is characterised in that the value of the N is fixed more than 1
And the integer value less than S or transformable it is more than 1 and less than the integer value of S.
7. method according to any one of claim 1 to 5, it is characterised in that the channel condition information includes channel
Quality indicator CQI information, order designator RI information and precoding designator PMI information.
8. a kind of information feedback device, is applied to terminal, it is characterised in that include：
Determining module, for the channel status letter of the N number of joint PMI information included in system bandwidth is determined using pilot signal
Breath；
Feedback module, for feeding back the channel condition information；
Wherein, the system bandwidth is S sets of subbands of high-rise configuration, and N is more than 1 and less than the integer of S.
9. device according to claim 8, it is characterised in that the feedback module is for according to one of following feedback model
Feed back the channel condition information：
In four antenna systems, the CQI of each subband, the system band in broadband CQI, broadband PMI, the system bandwidth are fed back
N number of joint PMI and broadband order designator information RI on width；
In eight antenna systems, the CQI of each subband in the broadband CQI, broadband i1, broadband i2, the system bandwidth is fed back,
N number of joint i2 and the broadband RI in the system bandwidth；
In eight antenna system, feed back every in the broadband CQI, the broadband i1, the broadband i2, the system bandwidth
N number of joint i1, N number of joint i2 and the broadband RI in the CQI of individual subband, the system bandwidth；
Feed back the CQI of each subband, the system in the broadband CQI, the broadband i1 and the broadband i2, the system bandwidth
The connection in N number of joint i1, N number of joint i2 in the system bandwidth, the broadband RI and the system bandwidth on regiment commander's width
Close RI.
10. device according to claim 8 or claim 9, it is characterised in that the value of the N is fixed more than 1 and less than S
Integer value, or transformable be more than 1 and less than the integer value of S.
11. devices according to claim 8 or claim 9, it is characterised in that the channel condition information is indicated comprising channel quality
Symbol CQI information, order designator RI information and precoding designator PMI information.
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| CN108631844B (en) * | 2017-03-24 | 2021-05-18 | 电信科学技术研究院 | Method, terminal and network side equipment for acquiring channel state information |
| CN108111211B (en) * | 2017-08-11 | 2021-11-02 | 中兴通讯股份有限公司 | Feedback method and device of channel state information and management equipment |
| WO2019068212A1 (en) * | 2017-10-02 | 2019-04-11 | Qualcomm Incorporated | Subband channel state information (csi) omission for type-ii csi |
| CN109660288B (en) * | 2019-03-05 | 2022-01-25 | 武汉虹信科技发展有限责任公司 | Information reporting method and device |
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| CN101867447A (en) * | 2010-04-30 | 2010-10-20 | 中兴通讯股份有限公司 | Feedback method of channel state information and terminal |
| CN101917260A (en) * | 2010-08-18 | 2010-12-15 | 中兴通讯股份有限公司 | Feedback method and device of channel state information |
| WO2010149089A1 (en) * | 2010-01-08 | 2010-12-29 | 中兴通讯股份有限公司 | Feedback transmission method of channel state information and user equipment |
| CN101969363A (en) * | 2010-09-30 | 2011-02-09 | 中兴通讯股份有限公司 | Channel state information feedback method and terminal |
| CN102013956A (en) * | 2010-11-25 | 2011-04-13 | 中兴通讯股份有限公司 | Method and device for feeding back channel state information |
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| WO2010149089A1 (en) * | 2010-01-08 | 2010-12-29 | 中兴通讯股份有限公司 | Feedback transmission method of channel state information and user equipment |
| CN101867447A (en) * | 2010-04-30 | 2010-10-20 | 中兴通讯股份有限公司 | Feedback method of channel state information and terminal |
| CN101917260A (en) * | 2010-08-18 | 2010-12-15 | 中兴通讯股份有限公司 | Feedback method and device of channel state information |
| CN101969363A (en) * | 2010-09-30 | 2011-02-09 | 中兴通讯股份有限公司 | Channel state information feedback method and terminal |
| CN102013956A (en) * | 2010-11-25 | 2011-04-13 | 中兴通讯股份有限公司 | Method and device for feeding back channel state information |
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