CN106330272A - Precoding matrix indicator (PMI) sending and receiving method, and devices - Google Patents
Precoding matrix indicator (PMI) sending and receiving method, and devices Download PDFInfo
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- CN106330272A CN106330272A CN201510373062.1A CN201510373062A CN106330272A CN 106330272 A CN106330272 A CN 106330272A CN 201510373062 A CN201510373062 A CN 201510373062A CN 106330272 A CN106330272 A CN 106330272A
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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
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
Abstract
The invention discloses a precoding matrix indicator (PMI) receiving method, which comprises steps: first codebook subset constraint signaling is sent, wherein the first codebook subset constraint signaling indicates an available PMI set in all PMIs; second codebook subset constraint signaling is sent, wherein on the basis of the first codebook subset constraint signaling, the second codebook subset constraint signaling indicates an available PMI set for UE; and CSI (Channel State Information) reported by the UE is received, wherein the CSI comprises PMIs obtained when the UE refers to the first codebook subset constraint signaling and the second codebook subset constraint signaling. The invention also discloses a PMI sending method, a PMI receiving device and a PMI sending device. When the technical scheme disclosed by the invention is applied, the PMI feedback problem in a multiuser multi-antenna system can be solved.
Description
Technical field
The application relates to wireless communication technology field, in particular it relates to a kind of pre-coding matrix instruction transmission and
Method of reseptance and equipment.
Background technology
In mobile communication multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) system,
Wireless fading channel has the feature of time variation, in order to effectively send signal, needs to obtain channel information, with reality
Existing user scheduling, spatial pre-coding and Modulation and Coding Scheme (Modulation and Coding Scheme, MCS)
Select.In order to obtain channel information, base station end (eNB) sends control signaling, instruction terminal (subscriber equipment,
User Equipment, UE) feed back corresponding channel condition information (Channel State Information, CSI).
ENB controls UE and is used for reporting time and the frequency resource of (report) channel condition information.Wherein, exist
In long evolving system (Long-Term Evolution, LTE), channel condition information includes:
Order instruction (RI, rank indication), is used to refer to the effective of Physical Downlink Shared Channel (PDSCH)
The data number of plies, channel quality is the best, then the valid data number of plies can supported is the most；
Channel quality instruction (CQI, channel quality indicator), represents the quality of present channel quality,
Corresponding with channel SNRs size；
Pre-coding matrix instruction (PMI, precoding matrix indicator), is used to refer to pre-coding matrix and exists
Index in code book；
Precoding type instruction (PTI, precoding type indicator), is used to refer to the class of precoding feedback
Type.
Wherein, PMI is for recommending pre-coding matrix to eNB, and the pre-coding matrix recommended is from code book, code
This is made up of more predefined pre-coding matrixes, and each pre-coding matrix and one or a group index pair
Should.Being fed back by PMI, eNB can find unique pre-coding matrix from predefined code book.
Although being measured by down channel, UE can estimate the down channel of eNB to UE, passes through down channel
Determine RI and PMI being matched with down channel, but UE be unable to estimate the down channel of eNB to other UE,
So RI and PMI that recommended of UE perhaps downlink transfer for eNB to this UE can obtain higher connecing
Receive signal intensity, but meanwhile, the user of same district or adjacent area may be produced bigger interference, therefore from being
From the perspective of system, RI and PMI that UE is recommended is possible and improper.
In order to solve this problem, LTE system introduces codebook subset constraint (Codebook Subset
Restriction, CSR) mechanism.Comprising multiple bit in CSR, each bit prelists with in code book
Code matrix or one group of pre-coding matrix are corresponding, and bit can disable in code book by the way of setting to 0 in CSR
A pre-coding matrix or one group of pre-coding matrix, thus only allow UE to report the precoding square that CSR allows
PMI corresponding to Zhen.Table 1 lists bit number and transmission needed for codebook subset constraint in available transmission pattern
The corresponding relation of pattern.
Table 1: bit number needed for codebook subset constraint in available transmission pattern
In LTE system, eNB is believed by wireless heterogeneous networks (Radio Resource Control, RRC)
Order issues CSR.Although a subset of pre-coding matrix set can be in PMI feeds back in CSR permission code book
Used, but in PMI feeds back, PMI is still used in code book pre-coding matrix in pre-coding matrix set
With the corresponding relation of pre-coding matrix index, therefore the bit number required for PMI feedback is not by the shadow of CSR value
Ring.
Along with the development of antenna technology especially active antenna array technology, physical antenna unit is not only at horizontal Fang Wei
Degree distribution, and be distributed vertically and horizontally two dimensions, form 2-D aerial array, such as Fig. 1 and Fig. 2 institute
Showing, wherein N represents the antenna number in horizontal monopole direction, and M represents the number of vertical dimension antenna.Fig. 1 is
Cross polarization 2-D aerial array, Fig. 2 is single polarization 2-D aerial array.
On the one hand, the appearance of 2-D aerial array makes the multi-user of vertical dimension wave beam forming, higher order
(Multi-user, MU) transmission is possibly realized.So-called MU transmission refers on identical running time-frequency resource simultaneously for many
Individual UE sends signal.But, vertical dimension wave beam forming, the MU transmission of higher order also make intrasystem interference
Change is frequently.
On the other hand, 2-D aerial array makes eNB antenna number increase considerably, and this will bring codebook size (institute
The number comprising pre-coding matrix) increase considerably the most therewith, the expense in CSR increases considerably the most therewith.
Along with the use of 2-D aerial array, full dimension MIMO (Full Dimension MIMO, FD-MIMO)
It is possibly realized.Compare the antenna number of mimo system due to FD-MIMO system to increase considerably, codebook size
Increasing considerably, the exponent number of MU transmission increases, and the mechanism of original RRC transmitting signaling downwards CSR may face one
A little new problems:
1) mechanism of existing semi-static RRC transmitting signaling downwards CSR is not suitable with in FD-MIMO system interference soon
The interference coordination demand become.
2) mode simply by Downlink Control Information (Downlink Control Information, DCI) is improved
CSR issuing mechanism, after significantly increasing owing to the expense of CSR increases with eNB antenna number, becomes infeasible.
3) existing CSR mechanism does not help reducing PMI feedback overhead, along with eNB antenna number increases PMI
Feedback overhead will increase considerably, it is necessary to uses effective manner to reduce PMI feedback overhead.
The gain of omnidirectional's multiple antennas essentially from multi-user multi-antenna (MU-MIMO, multi-user MIMO),
And MU-MIMO compares single user multiaerial system, in order to preferably eliminate inter-user interference, need more high-precision
The PMI of degree.In existing LTE/LTE-A system, code book sub-sampling (sub-sampling) can reduce PMI
Expense, but reduce the accuracy of PMI simultaneously, this will greatly lose the property of multi-user multi-aerial system
Can, thus reduce the gain of omnidirectional's multiple antennas.Therefore, existing code book sub-sampling is not suitable for omnidirectional many days
Wire system.
Summary of the invention
This application provides method of sending and receiving and the equipment of pre-coding matrix instruction, to solve multi-user many days
PMI feedback problem in wire system.
A kind of pre-coding matrix instruction PMI method of reseptance that the application provides, including:
Send the first codebook subset constraint signaling；Wherein, can use during the first codebook subset constraint signaling indicates all PMI
PMI set close；
Send the second codebook subset constraint signaling；Wherein, the second codebook subset constraint signaling is at the first codebook subset constraint
On the basis of signaling indicate UE can PMI set close；
Receive the channel condition information CSI of reported by user equipment UE, wherein comprise: UE is with reference to the first codebook subset about
The PMI obtained after Shu Xinling and the second codebook subset constraint signaling.
It is also preferred that the left send the frequency of the second codebook subset constraint signaling more than or equal to sending the first codebook subset constraint
The frequency of signaling.
It is also preferred that the left after sending the first codebook subset constraint signaling, also include:
The confirmation receiving the first codebook subset constraint signaling from UE receives signal.
It is also preferred that the left the second codebook subset constraint signaling indicates available on the basis of the first codebook subset constraint signaling
PMI set is closed and is included:
Second codebook subset constraint signaling directly indicates PMI set available in the first codebook subset constraint signaling to close；
Or, the second codebook subset constraint signaling indicates first available PMI, institute in the first codebook subset constraint signaling
Stating first available PMI and N-1 PMI afterwards thereof is available PMI, wherein, and the sum of available PMI
N is predefined；
Or, the bit that the PMI set that the second codebook subset constraint signaling indicates the first codebook subset constraint signaling to allow is closed
Position side-play amount.
It is also preferred that the left after the second codebook subset constraint signaling is used for receiving the subframe of the second codebook subset constraint signaling
The N1 subframe, the first codebook subset constraint signaling is used for receiving the first codebook subset constraint signaling really from UE
Recognizing the N2 subframe after receiving the subframe of signal, wherein, N1 and N2 is predefined.
It is also preferred that the left the confirmation of described first codebook subset constraint signaling receives signal it is: the agreement of an agreement bit
Value or first time comprise the numbering of the resource of the first codebook subset constraint signaling.
Present invention also provides a kind of PMI and receive equipment, including:
Sending module, for sending the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Receiver module, for receiving the CSI that UE reports, comprises UE with reference to the first codebook subset about in described CSI
The PMI obtained after Shu Xinling and the second codebook subset constraint signaling.
Present invention also provides a kind of PMI sending method, including:
Receive the first codebook subset constraint signaling；Wherein, can use during the first codebook subset constraint signaling indicates all PMI
PMI set close；
Receive the second codebook subset constraint signaling；Wherein, the second codebook subset constraint signaling is at the first codebook subset constraint
On the basis of signaling indicate UE can PMI set close；
Complete codebook subset constraint is obtained by the first codebook subset constraint signaling and the second codebook subset constraint signaling,
Obtain PMI with reference to described complete codebook subset constraint, and described PMI is included in CSI reports.
It is also preferred that the left the transmission frequency of the second codebook subset constraint signaling is more than or equal to the first codebook subset constraint signaling
Transmission frequency.
It is also preferred that the left receiving the first codebook subset constraint signaling, also include:
The confirmation reporting the first codebook subset constraint signaling receives signal.
It is also preferred that the left obtain complete code book by the first codebook subset constraint signaling and the second codebook subset constraint signaling
Collection constraint includes:
According to the second codebook subset constraint signaling: directly determine that PMI set available in the first codebook subset constraint signaling is closed；
Or, determine in the first codebook subset constraint signaling first available according to the second codebook subset constraint signaling
PMI, is defined as the PMI that can use by described first available PMI and N-1 PMI afterwards thereof, wherein, available
The total N of PMI be predefined；
Or, determine what the PMI set that the first codebook subset constraint signaling allows was closed according to the second codebook subset constraint signaling
Bit side-play amount, the PMI set the first codebook subset constraint signaling allowed is closed according to described bit side-play amount to the right
The PMI set that the bit of displacement correspondence obtains can use is closed.
It is also preferred that the left use described second receiving the N1 subframe after the subframe of the second codebook subset constraint signaling
Codebook subset constraint signaling, the N2 after the subframe confirming reception signal sending the first codebook subset constraint signaling
Individual subframe uses described first codebook subset constraint signaling, and wherein, N1 and N2 is predefined.
It is also preferred that the left the confirmation of described first codebook subset constraint signaling receives signal it is: the agreement of an agreement bit
Value or first time comprise the numbering of the resource of the first codebook subset constraint signaling.
Present invention also provides a kind of PMI and send equipment, including:
Receiver module, for receiving the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Measure reporting module, for being believed with reference to the first codebook subset constraint signaling and the second codebook subset constraint by UE
The PMI obtained after order is included in CSI and reports.
As seen from the above technical solution, the application provide pre-coding matrix instruction method of sending and receiving and set
Standby, CSR is divided into the first codebook subset constraint signaling and the second codebook subset constraint transmitting signaling downwards, UE by eNB
After receiving the first codebook subset constraint signaling and the second codebook subset constraint signaling, by the first codebook subset constraint letter
Order and the second codebook subset constraint signaling determine that available PMI set is closed, and determine PMI in available PMI set is closed,
And feed back to base station.By the application technique scheme, it is possible to obtain following beneficial effect:
1) by the first codebook subset constraint signaling and the second codebook subset constraint signaling being respectively adopted different sending out
Send the mode (such as: respectively by the way of semi-static signaling and dynamic signaling issue) that frequency issues, improve
The dynamic that CSR issues, so that CSR can meet in following multiaerial system disturbs higher time variation
Demand；
2) PMI feedback UE can PMI set close in coding rather than in original codebook set coding, from
And reduce PMI feedback overhead, avoid the PMI loss of significance that this sub-sampling of code brings simultaneously；
3) by user terminal, the merging of the first codebook subset constraint signaling and the second codebook subset constraint signaling is grasped
Make, it is achieved that dynamic codebook subset constraint, thus decrease the height that the semi-static characteristic of codebook subset constraint causes
Reconstruction delay；
4) receiving signal by the confirmation of the first codebook subset constraint signaling, base station can know that UE is carrying out PMI
Whether obtain codebook subset constraint signaling during selection, thus solve the fuzzy problem of RRC signaling.
Accompanying drawing explanation
Fig. 1 is cross polarization 2-D aerial array；
Fig. 2 is single polarization 2-D aerial array；
Fig. 3 is the schematic flow sheet of the preferable PMI method of reseptance of the application one；
Fig. 4 is the schematic flow sheet of the preferable PMI sending method of the application one；
Fig. 5 is the composition structural representation that the preferable PMI of the application one receives equipment；
Fig. 6 is the composition structural representation that the preferable PMI of the application one sends equipment.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, develop simultaneously enforcement referring to the drawings
Example, is described in further detail the application.
For solving the problem existing for prior art, this application provides a kind of PMI method of reseptance, the method should
For base station side, send the first codebook subset constraint signaling and the second codebook subset constraint signaling the most respectively；Its
In, the first codebook subset constraint signaling indicates PMI set available in all PMI to close, the second codebook subset constraint
Signaling indicate on the basis of the first codebook subset constraint signaling UE can PMI set close；Then, UE is received
The CSI reported, wherein comprises: UE is with reference to the first codebook subset constraint signaling and the second codebook subset constraint signaling
After the PMI that obtains.It is preferred that described PMI is UE in the second codebook subset constraint signaling at the first code book
Collection constraint signaling on the basis of instruction UE can PMI set close in select PMI.
It is preferred that the frequency sending the second codebook subset constraint signaling can be more than or equal to sending the first codebook subset
The frequency of constraint signaling.Additionally, send after the first codebook subset constraint signaling, it is also possible to including: receive the from UE
The confirmation of one codebook subset constraint signaling receives signal.
After receiving CSI, user can be dispatched according to prior art, and calculate precoding based on the CSI reported
Vector, then sends downstream grants (DL grant, Downlink assignment) at PDCCH/E-PDCCH,
And the data after PDSCH sends precoding.
Accordingly, present invention also provides a kind of PMI sending method, the method is applied to UE side, first,
Receive the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein, the first codebook subset constraint
Signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is at the first codebook subset about
On the basis of Shu Xinling indicate UE can PMI set close；Then, by the first codebook subset constraint signaling and
Second codebook subset constraint signaling obtains complete codebook subset constraint, with reference to described complete codebook subset constraint
Obtain PMI, finally described PMI is included in CSI and reports.
Wherein, UE obtains complete code with reference to the first codebook subset constraint signaling and the second codebook subset constraint signaling
After this subset restriction, from the available PMI indicated by the codebook subset constraint that this is complete combines, select PMI.
Existing PMI feedback is to encode in original codebook set, for example, it is assumed that codebook number is 16, then needs
Wanting 4 bits to transmit PMI, and in the application, UE is with reference to the first codebook subset constraint signaling and second code book
The collection constraint UE that obtains of signaling can the original codebook set of PMI set composition and division in a proportion little, accordingly, can use
Less bit carries out PMI feedback.
After reporting CSI, can according to prior art PDCCH/E-PDCCH obtain DL grant, and
PDSCH receives the data signal after precoding.
Below by several preferred embodiments, technical scheme is further elaborated.
Embodiment one:
Fig. 3 is the schematic flow sheet of the preferable PMI method of reseptance of the application one, and the method is applicable to base station side, ginseng
Seeing Fig. 3, this flow process includes:
Step 1: codebook subset constraint is divided into: the first codebook subset constraint set and second code book collection constraint set
Close, and respectively constitute the first codebook subset constraint signaling and the second codebook subset constraint signaling of correspondence.Wherein,
First codebook subset constraint signaling indicates PMI set available in all PMI to close, the second codebook subset constraint signaling
On the basis of the first codebook subset constraint signaling indicate UE can PMI set close, the second codebook subset constraint
Signaling can not be changed RI and limit, and, send the frequency of the second codebook subset constraint signaling more than or equal to sending out
Send the frequency of the first codebook subset constraint signaling.It is to say, at the beginning of the first codebook subset constraint signaling is used for indicating
The PMI set conjunction that step is available, the second codebook subset constraint signaling refers on the basis of the first codebook subset constraint signaling
Show that final available PMI set is closed.
It is also preferred that the left the first codebook subset constraint signaling and the second codebook subset constraint signaling can pass through bitmap bit
Mode indicate accordingly.Specifically, the second codebook subset constraint signaling is believed at the first codebook subset constraint
The mode indicating available PMI set to close on the basis of order has following several:
1) can use during the bitmap bit of the second codebook subset constraint signaling directly indicates the first codebook subset constraint signaling
PMI set close.
2) bitmap bit of the second codebook subset constraint signaling is first available in indicating the first codebook subset constraint signaling
PMI, described first available PMI and (N-1) individual PMI afterwards thereof be available PMI, wherein, available
The total N of PMI be predefined.
3) bitmap bit of the second codebook subset constraint signaling indicates the PMI that the first codebook subset constraint signaling allows
The bit side-play amount of set, such as: the bitmap bit assuming the second codebook subset constraint signaling is N,
The most available PMI set is combined into corresponding to the N number of bit of PMI right shift that the first codebook subset constraint signaling allows
PMI set close.
Step 2: in PDSCH channel send RRC signaling, wherein comprise the first codebook subset constraint signaling,
CQI reports configuration, CSI-RS configuration etc..
Step 3: send DCI at Physical Downlink Control Channel (PDCCH), wherein comprise the second codebook subset
Constraint signaling.
According to step 2 and step 3, in the present embodiment, the first codebook subset constraint signaling is adopted by RRC signaling
Sending by semi-static mode, the second codebook subset constraint signaling uses dynamic mode to send by DCI, this
Under the mode of kind, utilizing the motility of DCI, the second codebook subset constraint signaling can be fast according to the change of CSI
Speed change.
Step 4: the confirmation receiving the first codebook subset constraint signaling that UE reports receives signal and CSI, wherein
CSI includes PMI, and this PMI is that UE is with reference to the first codebook subset constraint signaling and the second codebook subset constraint letter
The PMI obtained after order.
Specifically, for receiving the mode reporting signal:
In periodicity CSI reports, first send periodic feedback at PDCCH by DCI and trigger signal, then
Detected by PUSCH and receive periodically CSI and report；
Or, in aperiodicity CSI reports, receive aperiodicity by PUCCH or PUSCH detection
CSI reports.
Owing to the second codebook subset constraint signaling sends at PDCCH, then it is believed that the second code book in this subframe
Subset restriction signaling is successfully received, and is used for receiving after the subframe of the second codebook subset constraint signaling
N1 subframe, wherein N1 is predefined.First codebook subset constraint signaling is used for receiving from UE
The N2 subframe after the subframe confirming reception signal of the first codebook subset constraint signaling, wherein N2 is pre-
First define.The confirmation of the first codebook subset constraint signaling receives signal can be there to be following several form:
UE reports a bit, and the confirmation as the first codebook subset constraint signaling receives signal, notifies code book
The change of subset restriction, if this bit is that 1 expression is properly received the first codebook subset constraint signaling；
Or, UE can report the numbering of the resource for the first time comprising the first codebook subset constraint signaling, as with
Confirmation in the first codebook subset constraint signaling receives signal.Such as: assume that the first codebook subset constraint signaling is led to
Cross RRC signaling to send, then, the subframe number comprising the first codebook subset constraint signaling for the first time can be made
It it is the confirmation reception signal of the first codebook subset constraint signaling.
Step 5: scheduling user, calculates precoding vector based on the CSI reported.
Step 6: send downstream grants (DL grant, Downlink assignment) at PDCCH/E-PDCCH,
Data after PDSCH sends precoding.
Embodiment two:
Fig. 4 is the schematic flow sheet of the preferable PMI sending method of the application one, and the method is applicable to UE side, ginseng
Seeing Fig. 4, this flow process includes:
Step 1: by PDSCH detection receive RRC signaling, wherein comprise the first codebook subset constraint signaling,
CQI reports configuration and CSI-RS configuration etc..
Step 2: obtain DCI by PDCCH detection, thus obtain the second codebook subset constraint signaling.
Step 3: according to the method in embodiment one step 1, by the first codebook subset constraint signaling and second code
This subset restriction signaling inversely obtains complete codebook subset constraint, then passes through channel state information reference signals
(CSI-RS) and channel condition information interferometry (CSI-IM) calculates CSI to be reported, wherein comprise
PMI。
Step 4: the confirmation sending the first codebook subset constraint signaling receives signal and reports CSI, wherein in CSI
Comprise with reference to the PMI after codebook subset constraint.Wherein, the first code book is generated according to the step 4 of embodiment one
The confirmation of subset restriction signaling receives signal.For sending the mode reporting signal, specifically:
In periodicity CSI reports, first in PDCCH reception to DCI, it is thus achieved that periodic feedback triggers signal, so
After send periodically CSI at PUSCH and report signal；
Or in aperiodicity CSI reports, send aperiodicity CSI at PUCCH or PUSCH and report.
Step 5: obtain downstream grants (DL grant, Downlink assignment) at PDCCH/E-PDCCH,
Data signal after PDSCH receives precoding.
Embodiment three:
Corresponding to above-mentioned PMI method of reseptance, the present embodiment provides a kind of PMI to receive equipment, and it preferably forms structure
Include as it is shown in figure 5, this PMI receives equipment:
Sending module, for sending the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Receiver module, for receiving the CSI that UE reports, comprises UE with reference to the first codebook subset about in described CSI
The PMI obtained after Shu Xinling and the second codebook subset constraint signaling.
It is preferred that the equipment of PMI reception shown in Fig. 5 can also include scheduler module and precoding module, wherein:
Described scheduler module, is used for being scheduling, and the PMI reported based on UE calculates precoding vector；
Described precoding module, for sending DL grant at PDCCH/E-PDCCH, and sends pre-at PDSCH
Data after coding.
Embodiment four:
Corresponding to above-mentioned PMI sending method, the present embodiment provides a kind of PMI to send equipment, and it preferably forms structure
As shown in Figure 6, this PMI transmission equipment includes:
Receiver module, for receiving the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Measure reporting module, for by UE reference the first codebook subset constraint signaling and the second codebook subset constraint signaling
After the PMI that obtains be included in CSI and report.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all in the application
Spirit and principle within, any modification, equivalent substitution and improvement etc. done, should be included in the application protect
Within the scope of protecting.
Claims (14)
1. a pre-coding matrix instruction PMI method of reseptance, it is characterised in that including:
Send the first codebook subset constraint signaling；Wherein, can use during the first codebook subset constraint signaling indicates all PMI
PMI set close；
Send the second codebook subset constraint signaling；Wherein, the second codebook subset constraint signaling is at the first codebook subset constraint
On the basis of signaling indicate UE can PMI set close；
Receive the channel condition information CSI of reported by user equipment UE, wherein comprise: UE is with reference to the first codebook subset about
The PMI obtained after Shu Xinling and the second codebook subset constraint signaling.
Method the most according to claim 1, it is characterised in that:
Send the frequency of the second codebook subset constraint signaling more than or equal to sending the first codebook subset constraint signaling
Frequency.
Method the most according to claim 1 and 2, it is characterised in that send the first codebook subset constraint signaling
After, also include:
The confirmation receiving the first codebook subset constraint signaling from UE receives signal.
Method the most according to claim 1 and 2, it is characterised in that the second codebook subset constraint signaling is
Indicate available PMI set to close on the basis of one codebook subset constraint signaling to include:
Second codebook subset constraint signaling directly indicates PMI set available in the first codebook subset constraint signaling to close；
Or, the second codebook subset constraint signaling indicates first available PMI, institute in the first codebook subset constraint signaling
Stating first available PMI and N-1 PMI afterwards thereof is available PMI, wherein, and the sum of available PMI
N is predefined；
Or, the bit that the PMI set that the second codebook subset constraint signaling indicates the first codebook subset constraint signaling to allow is closed
Position side-play amount.
Method the most according to claim 1 and 2, it is characterised in that:
Second codebook subset constraint signaling is used for the N1 after receiving the subframe of the second codebook subset constraint signaling
Subframe, the first codebook subset constraint signaling is used for receiving from UE the confirmation of the first codebook subset constraint signaling and receives
The N2 subframe after the subframe of signal, wherein, N1 and N2 is predefined.
Method the most according to claim 1 and 2, it is characterised in that described first codebook subset constraint signaling
Confirmation receive signal be:
The agreement value of one agreement bit or first time comprise the volume of the resource of the first codebook subset constraint signaling
Number.
7. a PMI receives equipment, it is characterised in that including:
Sending module, for sending the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Receiver module, for receiving the CSI that UE reports, comprises UE with reference to the first codebook subset about in described CSI
The PMI obtained after Shu Xinling and the second codebook subset constraint signaling.
8. a PMI sending method, it is characterised in that including:
Receive the first codebook subset constraint signaling；Wherein, can use during the first codebook subset constraint signaling indicates all PMI
PMI set close；
Receive the second codebook subset constraint signaling；Wherein, the second codebook subset constraint signaling is at the first codebook subset constraint
On the basis of signaling indicate UE can PMI set close；
Complete codebook subset constraint is obtained by the first codebook subset constraint signaling and the second codebook subset constraint signaling,
Obtain PMI with reference to described complete codebook subset constraint, and described PMI is included in CSI reports.
Method the most according to claim 8, it is characterised in that:
The transmission frequency of the second codebook subset constraint signaling is more than or equal to the transmission of the first codebook subset constraint signaling
Frequency.
Method the most according to claim 8 or claim 9, it is characterised in that receiving the first codebook subset constraint
Signaling, also includes:
The confirmation reporting the first codebook subset constraint signaling receives signal.
11. methods according to claim 8 or claim 9, it is characterised in that by the first codebook subset constraint signaling
Obtain complete codebook subset constraint with the second codebook subset constraint signaling to include:
According to the second codebook subset constraint signaling: directly determine that PMI set available in the first codebook subset constraint signaling is closed；
Or, determine in the first codebook subset constraint signaling first available according to the second codebook subset constraint signaling
PMI, is defined as the PMI that can use by described first available PMI and N-1 PMI afterwards thereof, wherein, available
The total N of PMI be predefined；
Or, determine what the PMI set that the first codebook subset constraint signaling allows was closed according to the second codebook subset constraint signaling
Bit side-play amount, the PMI set the first codebook subset constraint signaling allowed is closed according to described bit side-play amount to the right
The PMI set that the bit of displacement correspondence obtains can use is closed.
12. methods according to claim 8 or claim 9, it is characterised in that:
Described second codebook subset is used receiving the N1 subframe after the subframe of the second codebook subset constraint signaling
Constraint signaling, the N2 subframe after the subframe confirming reception signal sending the first codebook subset constraint signaling
Using described first codebook subset constraint signaling, wherein, N1 and N2 is predefined.
13. methods according to claim 8 or claim 9, it is characterised in that described first codebook subset constraint signaling
Confirmation receive signal be:
The agreement value of one agreement bit or first time comprise the volume of the resource of the first codebook subset constraint signaling
Number.
14. 1 kinds of PMI send equipment, it is characterised in that including:
Receiver module, for receiving the first codebook subset constraint signaling and the second codebook subset constraint signaling；Wherein,
One codebook subset constraint signaling indicates PMI set available in all PMI to close, and the second codebook subset constraint signaling is first
On the basis of codebook subset constraint signaling indicate UE can PMI set close；
Measure reporting module, for by UE reference the first codebook subset constraint signaling and the second codebook subset constraint signaling
After the PMI that obtains be included in CSI and report.
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| CN201510373062.1A CN106330272A (en) | 2015-06-30 | 2015-06-30 | Precoding matrix indicator (PMI) sending and receiving method, and devices |
| PCT/KR2016/007020 WO2017003208A1 (en) | 2015-06-30 | 2016-06-30 | Pmi transmitting method, pmi receiving method and devices thereof |
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| ES2750869T3 (en) * | 2010-04-07 | 2020-03-27 | Ericsson Telefon Ab L M | A precoder structure for MIMO precoding |
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| US9407343B2 (en) * | 2012-08-31 | 2016-08-02 | Google Technology Holdings LLC | Method and apparatus for mitigating downlink interference |
| WO2014062195A1 (en) * | 2012-10-19 | 2014-04-24 | Nokia Siemens Networks Oy | Csi feedback with elevation beamforming |
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