CN107294580A - The feedback method and device of pre-coding matrix instruction - Google Patents
The feedback method and device of pre-coding matrix instruction Download PDFInfo
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- CN107294580A CN107294580A CN201610192067.9A CN201610192067A CN107294580A CN 107294580 A CN107294580 A CN 107294580A CN 201610192067 A CN201610192067 A CN 201610192067A CN 107294580 A CN107294580 A CN 107294580A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a kind of pre-coding matrix instruction PMI feedback method and device.The feedback method comprises the following steps：Carry out the first PMI calculating；Reporting for the first PMI is carried out, wherein when that can not obtain a PMI in time, the PMI of mark the first calculating has sequence problem；Decided whether to carry out the 2nd PMI calculating with the presence or absence of sequence problem according to the first PMI calculating, wherein when the first PMI calculating has sequence problem, abandoning the 2nd PMI calculating；And carry out reporting for the 2nd PMI.
Description
Technical field
Prelisted the invention mainly relates to one kind in moving communicating field, more particularly to radio honeycomb communication system
Feedback method and device that code matrix is indicated.
Background technology
In LTE Rel-8 standards, LTE system introduces closed loop precoding technology to improve spectrum efficiency.
Closed loop precoding requires all to preserve same prelist in base station and user terminal (User equipment, UE) first
The set of code matrix, referred to as code book.Terminal is estimated after channel condition information according to cell common pilots, is pressed
Certain criterion selects a pre-coding matrix from code book.The criterion of selection can be based on maximization phase mutual trust
Breath amount chosen, choose etc. based on maximizing output Signal to Interference plus Noise Ratio.Terminal is by the precoding selected
The index of matrix in the codebook feeds back to base station by up channel, and the index is designated as pre-coding matrix instruction
(Precoding Matrix Indicator,PMI).Base station is assured that by the PMI received should to the terminal
The pre-coding matrix used, the pre-coding matrix that terminal is reported can be regarded as the quantized value of channel condition information.
It is being new the one of representative with LTE (Long Term Evolution, Long Term Evolution)/LTE-Advanced
For in a variety of transmission modes of radio honeycomb communication system, feeding back precoding matrix indicates (Precoding Matrix
Indicator, PMI) it is a wherein indispensable ring, and very high request is proposed to feedback in time.
But, the limitation that chip calculates disposal ability and inside structure time delay is limited to, actually terminal may
The calculating for not having enough resources to complete PMI in PMI, or extreme peak value processing scene can not be calculated in time,
Cause terminal can not report PMI in time.
In LTE system, a kind of mode made up is to be given the correct time in terminal, once judge that learn can not in time (i.e.
When lockup is reached) obtain the newest PMI calculated in real time, then the PMI directly once reported before
To maintain basic link.
But under the transmission mode 9 that LTE-A is newly introduced, agreement introduces PMI layerings and reports mechanism,
That is H (PMI)=H (PMI_i1) * H (PMI_i2), wherein the first PMI, i.e. PMI_i1 are long period
The pre-coding matrix of change, and the 2nd PMI, PMI_i2 are the pre-coding matrixes of change in the short time.At this
In the case of kind, if sometime PMI_i1 can not be reported and the foregoing strategy of simple application in time, it is reported
Before the PMI_i1 (being designated as PMI_i1_0) that reports, then be likely to occur problem.Because network side (eNB) is assumed
The PMI_i2 that terminal is reported is all based on the reason that PMI_i1 is calculated reported before.So report
When follow-up PMI_i2 is reported after PMI_i1_0, once it (is no longer PMI_i1_0 that PMI_i1, which changes,
But such as PMI_i1_1), then the PMI_i2 for being calculated and subsequently being reported based on PMI_i1_1 is meaningless, and
And PMI_i2 calculating also takes up the valuable computing resource of terminal chip.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of feedback method of pre-coding matrix instruction and device,
Insignificant pre-coding matrix instruction can be avoided to calculate.
In order to solve the above technical problems, the invention provides a kind of pre-coding matrix instruction PMI feedback method,
Comprise the following steps：Carry out the first PMI calculating；Reporting for the first PMI is carried out, wherein when can not obtain in time
When obtaining a PMI, there is sequence problem in the PMI of mark the first calculating；Whether deposited according to the first PMI calculating
Decide whether to carry out the 2nd PMI calculating in sequence problem, wherein when the first PMI calculating has sequence problem
When, abandon the 2nd PMI calculating；And carry out reporting for the 2nd PMI.
In one embodiment of this invention, including the step of reporting for the first PMI is carried out：When reporting the first PMI
Lockup reach when, check the first PMI calculating whether complete；If the first PMI calculating is complete
Into, then report calculate obtained by the first PMI；If the first PMI calculating is not yet completed, report on previous
First PMI of report.
In one embodiment of this invention, including the step of reporting for the 2nd PMI is carried out：When reporting the 2nd PMI
Lockup reach when, check the 2nd PMI calculating whether complete；If the 2nd PMI calculating is complete
Into, then report calculate obtained by the 2nd PMI；And if the 2nd PMI calculating is not yet completed, then before reporting
Secondary the 2nd PMI reported.
In one embodiment of this invention, when previous the first PMI reported is not present, using default value 0 or
Any number that person's agreement closes rule is used as previous the first PMI reported.
In one embodiment of this invention, when previous the 2nd PMI reported is not present, using default value 0 or
Any number that person's agreement closes rule is used as previous the 2nd PMI reported.
The present invention also proposes a kind of pre-coding matrix instruction PMI feedback method, comprises the following steps：Carry out
First PMI calculating；Carry out reporting for the first PMI；The 2nd PMI calculating is carried out, wherein according to before
Secondary the first PMI reported calculates the 2nd PMI；And carry out reporting for the 2nd PMI.
In one embodiment of this invention, including the step of reporting for the first PMI is carried out：When reporting the first PMI
Lockup reach when, check the first PMI calculating whether complete；If the first PMI calculating is complete
Into, then report calculate obtained by the first PMI；If the first PMI calculating is not yet completed, report on previous
First PMI of report.
In one embodiment of this invention, including the step of reporting for the 2nd PMI is carried out：When reporting the 2nd PMI
Lockup reach when, check the 2nd PMI calculating whether complete；If the 2nd PMI calculating is complete
Into, then report calculate obtained by the 2nd PMI；And if the 2nd PMI calculating is not yet completed, then before reporting
Secondary the 2nd PMI reported.
In one embodiment of this invention, when previous the first PMI reported is not present, using default value 0 or
Any number that person's agreement closes rule is used as previous the first PMI reported.
In one embodiment of this invention, when previous the 2nd PMI reported is not present, using default value 0 or
Any number that person's agreement closes rule is used as previous the 2nd PMI reported.
The present invention also proposes a kind of pre-coding matrix instruction PMI feedback device, including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI, wherein when a PMI can not be obtained in time, mark the
There is sequence problem in one PMI calculating；
For being decided whether to carry out the 2nd PMI calculating with the presence or absence of sequence problem according to the first PMI calculating
Module, wherein when the first PMI calculating has sequence problem, abandoning the 2nd PMI calculating；And
The module reported for carrying out the 2nd PMI.
The present invention also proposes a kind of pre-coding matrix instruction PMI feedback device, including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI；
For the module for the calculating for carrying out the 2nd PMI, wherein calculating the according to previous the first PMI that reports
Two PMI；And
The module reported for carrying out the 2nd PMI.
Compared with prior art, one aspect of the present invention stops follow-up after there are the first PMI timing failures
2nd PMI calculating, reduces computation complexity, alleviates the appearance of follow-up sequence problem, improves and is
The robustness of system；Another aspect of the present invention is calculated by way of feeding back based on the first PMI actually reported
2nd PMI of gained.Therefore, the present invention can be calculated or the 2nd PMI of optimization by abandoning the 2nd PMI
The mode of calculating avoids invalid computation.
Brief description of the drawings
Fig. 1 is that the first PMI of first embodiment of the invention calculates report flow.
Fig. 2 is that the 2nd PMI of first embodiment of the invention calculates report flow.
Fig. 3 is that the first PMI of second embodiment of the invention calculates report flow.
Fig. 4 is that the 2nd PMI of second embodiment of the invention calculates report flow.
Embodiment
For the above objects, features and advantages of the present invention can be become apparent, below in conjunction with accompanying drawing to this hair
Bright embodiment elaborates.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still of the invention
It can also be implemented using other different from other manner described here, therefore the present invention is not by described below
Specific embodiment limitation.
Pre-coding matrix instruction PMI feedback method is present embodiments described, it is in user terminal
(UE) implement in, to solve the problem of pre-coding matrix instruction is calculated under lte-a system.The present invention's
User terminal may include but be not limited to：Mobile phone, tablet personal computer, wearable electronic etc..It is new in LTE-A
Under the transmission mode 9 of introducing, agreement introduces PMI layerings and reports mechanism, i.e. H (PMI)=H (PMI_i1)
* H (PMI_i2), wherein PMI_i1 is the pre-coding matrix just changed the long period, and PMI_i2 is in short-term
The pre-coding matrix of interior change.In the context of the present invention, PMI_i1 is referred to as the first PMI, will
PMI_i2 is referred to as the 2nd PMI.
First embodiment
Fig. 1 is that the first PMI of first embodiment of the invention calculates report flow.With reference to shown in Fig. 1, this reality
The feedback method for applying a kind of pre-coding matrix instruction PMI of example first carries out the first PMI calculating report flows, bag
Include following steps：
In step 101, the first PMI periodicity calculates report flow and started.
In step 102, the first PMI calculating is carried out.
In this step, terminal can the first PMI of call number signal processing unit calculating.
Step 103-109 carries out reporting for the first PMI, and description developed below.
In step 103, the first PMI periodicity reports lockup to reach.
In step 104, judge whether the first PMI calculating completes.
That is, step 104 can be judged when reporting lockup to reach, if obtain first in time
PMI。
If the first PMI calculating has been completed, the first PMI obtained by calculating is reported in step 105；Connect
In step 106, the first PMI that record is this time calculated is PMI_i1_record；Then in step 107,
Due to that can obtain the first PMI in time, then sequence problem is not present in the PMI of mark the first calculating.In step 107
In, this is documented in a flag bit PMI_Seq_Error, in the absence of sequence problem, then
PMI_Seq_Error=FALSE.
If the first PMI calculating is not yet completed, previous the first PMI reported is reported in step 108；
In this step, previous the first PMI as PMI_i1_record reported are that is, previous successfully to calculate and preserve
First PMI；In step 109, during due to that can not obtain a PMI in time, the PMI of mark the first calculating is deposited
In sequence problem, i.e. PMI_Seq_Error=TRUE.
Terminate the first PMI calculating report flow after step 107 and 109.
Fig. 2 is that the 2nd PMI of first embodiment of the invention calculates report flow.With reference to shown in Fig. 2, this reality
Hereafter the feedback method for applying a kind of pre-coding matrix instruction PMI of example carries out the 2nd PMI calculating report flows,
Comprise the following steps：
In step 201, the 2nd PMI periodicity calculates report flow and started.
Because the 2nd PMI is the pre-coding matrix that changes in the short time, therefore after the first PMI is reported,
It might have reporting for multiple 2nd PMI.
Carry out second with the presence or absence of sequence problem can be decided whether according to the first PMI calculating in step 202-203
PMI calculating.Specifically, in step 202, judge that the first PMI calculating whether there is sequence problem,
If in the calculating for abandoning the 2nd PMI, otherwise into step 203；In step 203, obtained based on calculating
First PMI calculates the 2nd PMI.In this step, terminal can the 2nd PMI of call number signal processing unit calculating.
Step 204-208 carries out reporting for the 2nd PMI, and description developed below.
In step 204, the 2nd PMI periodicity reports lockup to reach.
In step 205, judge whether the 2nd PMI calculating completes.
If the 2nd PMI calculating has been completed, in step 206, the 2nd PMI obtained by calculating is reported；
Then in step 207, the 2nd PMI that record is this time calculated is PMI_i2_record.
If the 2nd PMI calculating is not yet completed, in step 208, previous the 2nd PMI reported is reported.
In this step, previous the 2nd PMI as PMI_i2_record reported, i.e., previous successfully to calculate and preserve
The 2nd PMI.
In flow shown in Fig. 1, when previous the first PMI reported is not present, using default value 0 or
Any number that agreement closes rule is used as previous the first PMI reported.
Similarly, in flow shown in Fig. 2, when previous the 2nd PMI reported is not present, acquiescence is used
Any number that value 0 or agreement close rule is used as previous the 2nd PMI reported.
The feedback method of the present embodiment is able to record that the first PMI timing failures, and the first PMI once occurs
Timing failure then stops follow-up 2nd PMI calculating, reduces computation complexity, alleviates follow-up sequential and asks
The appearance of topic, further improves the robustness of system.
Second embodiment
Fig. 3 is that the first PMI of second embodiment of the invention calculates report flow.With reference to shown in Fig. 3, this reality
The feedback method for applying a kind of pre-coding matrix instruction PMI of example first carries out the first PMI calculating report flows, bag
Include following steps：
In step 301, the first PMI periodicity calculates report flow and started.
In step 302, the first PMI calculating is carried out.
In this step, terminal can the first PMI of call number signal processing unit calculating.
Step 303-307 carries out reporting for the first PMI, and description developed below.
In step 303, the first PMI periodicity reports lockup to reach.
In step 304, judge whether the first PMI calculating completes.
That is, step 304 can be judged when reporting lockup to reach, if obtain first in time
PMI。
If the first PMI calculating has been completed, the first PMI obtained by calculating is reported in step 305；Connect
In step 306, the first PMI that record is this time calculated is PMI_i1_record；
If the first PMI calculating is not yet completed, previous the first PMI reported is reported in step 307；
In this step, previous the first PMI as PMI_i1_record reported are that is, previous successfully to calculate and preserve
First PMI.
Terminate the first PMI calculating report flow after step 306 and 307.
Fig. 4 is that the 2nd PMI of second embodiment of the invention calculates report flow.With reference to shown in Fig. 4, this reality
Hereafter the feedback method for applying a kind of pre-coding matrix instruction PMI of example carries out the 2nd PMI calculating report flows,
Comprise the following steps：
In step 401, the 2nd PMI periodicity calculates report flow and started.
Because the 2nd PMI is the pre-coding matrix that changes in the short time, therefore after the first PMI is reported,
It might have reporting for multiple 2nd PMI.
In step 402, the 2nd PMI is calculated based on previous the first PMI reported.In this step, terminal meeting
Call number signal processing unit calculates the 2nd PMI.
Step 403-407 carries out reporting for the 2nd PMI, and description developed below.
In step 403, the 2nd PMI periodicity reports lockup to reach.
In step 404, judge whether the 2nd PMI calculating completes.
If the 2nd PMI calculating has been completed, in step 405, the 2nd PMI obtained by calculating is reported；
Then in step 406, the 2nd PMI that record is this time calculated is PMI_i2_record.
If the 2nd PMI calculating is not yet completed, in step 407, previous the 2nd PMI reported is reported.
In this step, previous the 2nd PMI as PMI_i2_record reported, i.e., previous successfully to calculate and preserve
The 2nd PMI.
In flow shown in Fig. 3, when previous the first PMI reported is not present, using default value 0 or
Any number that agreement closes rule is used as previous the first PMI reported.
Similarly, in flow shown in Fig. 4, when previous the 2nd PMI reported is not present, acquiescence is used
Any number that value 0 or agreement close rule is used as previous the 2nd PMI reported.
The feedback method of the present embodiment calculates gained by way of feeding back based on the first PMI actually reported
The 2nd PMI, this actual the first PMI reported had both been probably to calculate successful first PMI, it is also possible to
It is previous the first PMI for calculating and successfully and reporting, because the 2nd PMI is according to the first PMI reported recently
Calculating is obtained, compared with existing calculation, and the present embodiment is not in sequence problem, thus there is provided anti-
The more excellent solution of feedback.
From another viewpoint, embodiments of the invention provide a kind of pre-coding matrix instruction PMI feedback device,
Including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI, wherein when a PMI can not be obtained in time, mark the
There is sequence problem in one PMI calculating；
For being decided whether to carry out the 2nd PMI calculating with the presence or absence of sequence problem according to the first PMI calculating
Module, wherein when the first PMI calculating has sequence problem, abandoning the 2nd PMI calculating；And
The module reported for carrying out the 2nd PMI.
From another viewpoint, embodiments of the invention provide another pre-coding matrix instruction PMI feedback dress
Put, including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI；
For the module for the calculating for carrying out the 2nd PMI, wherein calculating the according to previous the first PMI that reports
Two PMI；And
The module reported for carrying out the 2nd PMI.
Above-mentioned device can be combined in user equipment, such as mobile phone, tablet personal computer, wearable electronic
In.From another viewpoint, the present invention proposes that a kind of user equipment, including pre-coding matrix as described above refer to
Show PMI feedback device.
The pre-coding matrix instruction PMI of the above embodiment of the present invention feedback method can be in such as computer
It is carried out in the computer-readable medium of the combination of software, hardware or computer software and hardware.For
Hardware implement for, embodiment described in the present invention can one or more application specific integrated circuits (ASIC),
Digital signal processor (DSP), digital signal processing device (DSPD), PLD (PLD),
Field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, it is used for
The selection for performing the other electronic installations or said apparatus of above-mentioned functions combines to be carried out.In partial picture
Under, this kind of embodiment can be implemented by controller.
For software implementation, embodiment described in the present invention can pass through such as program module
(procedures) it is carried out with the independent software module such as function module (functions), wherein often
One module performs one or more functions described herein and operation.Software code can be by suitably compiling
Journey language calls the turn the application software write to be carried out, and can be stored in internal memory, by controller or processor
Perform.
Although the present invention is described with reference to current specific embodiment, common skill in the art
Art personnel are it should be appreciated that the embodiment of the above is intended merely to the explanation present invention, without departing from essence of the invention
Various equivalent change or replacement can be also made in the case of god, therefore, as long as in the connotation of the present invention
In the range of the change, modification of above-described embodiment will all be fallen in the range of following claims.
Claims (12)
1. a kind of pre-coding matrix instruction PMI feedback method, comprises the following steps：
Carry out the first PMI calculating；
Reporting for the first PMI is carried out, wherein when a PMI can not be obtained in time, the PMI of mark the first meter
There is sequence problem in calculation；
Decided whether to carry out the 2nd PMI calculating with the presence or absence of sequence problem according to the first PMI calculating, wherein
When the first PMI calculating has sequence problem, the 2nd PMI calculating is abandoned；And
Carry out reporting for the 2nd PMI.
2. the method as described in claim 1, it is characterised in that carry out including the step of reporting for the first PMI：
When the lockup for reporting the first PMI is reached, check whether the first PMI calculating completes；
If the first PMI calculating has been completed, the first PMI obtained by calculating is reported；
If the first PMI calculating is not yet completed, previous the first PMI reported is reported.
3. the method as described in claim 1, it is characterised in that carry out including the step of reporting for the 2nd PMI：
When the lockup for reporting the 2nd PMI is reached, check whether the 2nd PMI calculating completes；
If the 2nd PMI calculating has been completed, the 2nd PMI obtained by calculating is reported；And
If the 2nd PMI calculating is not yet completed, previous the 2nd PMI reported is reported.
4. pre-coding matrix instruction PMI according to claim 2 feedback method, it is characterised in that
When previous the first PMI reported is not present, any numbers of rule is closed as preceding using default value 0 or agreement
Secondary the first PMI reported.
5. pre-coding matrix instruction PMI according to claim 3 feedback method, it is characterised in that
When previous the 2nd PMI reported is not present, any numbers of rule is closed as preceding using default value 0 or agreement
Secondary the 2nd PMI reported.
6. a kind of pre-coding matrix instruction PMI feedback method, comprises the following steps：
Carry out the first PMI calculating；
Carry out reporting for the first PMI；
The 2nd PMI calculating is carried out, wherein calculating the 2nd PMI according to previous the first PMI reported；With
And
Carry out reporting for the 2nd PMI.
7. method as claimed in claim 6, it is characterised in that carry out including the step of reporting for the first PMI：
When the lockup for reporting the first PMI is reached, check whether the first PMI calculating completes；
If the first PMI calculating has been completed, the first PMI obtained by calculating is reported；
If the first PMI calculating is not yet completed, previous the first PMI reported is reported.
8. method as claimed in claim 6, it is characterised in that carry out including the step of reporting for the 2nd PMI：
When the lockup for reporting the 2nd PMI is reached, check whether the 2nd PMI calculating completes；
If the 2nd PMI calculating has been completed, the 2nd PMI obtained by calculating is reported；And
If the 2nd PMI calculating is not yet completed, previous the 2nd PMI reported is reported.
9. pre-coding matrix instruction PMI according to claim 7 feedback method, it is characterised in that
When previous the first PMI reported is not present, any numbers of rule is closed as preceding using default value 0 or agreement
Secondary the first PMI reported.
10. pre-coding matrix instruction PMI according to claim 8 feedback method, it is characterised in that
When previous the 2nd PMI reported is not present, any numbers of rule is closed as preceding using default value 0 or agreement
Secondary the 2nd PMI reported.
11. a kind of pre-coding matrix instruction PMI feedback device, including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI, wherein when a PMI can not be obtained in time, mark the
There is sequence problem in one PMI calculating；
For being decided whether to carry out the 2nd PMI calculating with the presence or absence of sequence problem according to the first PMI calculating
Module, wherein when the first PMI calculating has sequence problem, abandoning the 2nd PMI calculating；And
The module reported for carrying out the 2nd PMI.
12. a kind of pre-coding matrix instruction PMI feedback device, including：
For the module for the calculating for carrying out the first PMI；
The module reported for carrying out the first PMI；
For the module for the calculating for carrying out the 2nd PMI, wherein calculating the according to previous the first PMI that reports
Two PMI；And
The module reported for carrying out the 2nd PMI.
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