CN106160924A - A kind of method of information feedback, device, terminal and base station - Google Patents
A kind of method of information feedback, device, terminal and base station Download PDFInfo
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- CN106160924A CN106160924A CN201510160726.6A CN201510160726A CN106160924A CN 106160924 A CN106160924 A CN 106160924A CN 201510160726 A CN201510160726 A CN 201510160726A CN 106160924 A CN106160924 A CN 106160924A
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- cqi
- base station
- terminal
- transmission antenna
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a kind of method of information feedback, device, terminal and base station.The method of described information feedback, including: obtain the reference information that base station sends；According to described reference information, obtain the channel transfer matrices between the port that the Sounding Reference Signal SRS transmission antenna of terminal is corresponding with the described reference information of described base station；According to described channel transfer matrices, obtain under base station is in maximum-ratio combing transmission mode, the channel quality indicator (CQI) of described SRS transmission antenna；Transmission feeds back to described base station, including at least described CQI in described feedback information.Such scheme, can support the more port number in base station, and meanwhile, with end side, the CQI of terminal feedback supports that the antenna that SRS sends is corresponding, and this kind of feedback system reduces power loss, improve the feedback precision of CQI.
Description
Technical field
The present invention relates to wireless communication technique field, particularly to a kind of information feedback method,
Device, terminal and base station.
Background technology
At existing TD-LTE (Time Division-Long Term Evolution, timesharing Long Term Evolution) it is
In system, transmission means based on channel reciprocity can be according to net carrying out information feedback when
The selection of configuration of network side is based on sending the information feedback of diversity and based on PMI (Pre-coding
Matrix Indicator, pre-coding matrix indicate) information feedback:
For information feedback pattern based on transmission diversity, detailed process is as follows: 1) eNB
(Evolved Node B, the most evolved Node B are called for short eNB, the title of base station in LTE) sends ginseng
Examine signal CRS (public reference signal) or CSI-RS (Channel State Information Reference
Signal, channel state information reference signals)；2) UE (User Equipment, subscriber equipment, i.e. terminal)
Carry out channel estimation according to CRS or CSI-RS, and assume that base station uses the transmission means sending diversity, UE
Calculate and feed back CQI (channel quality indicator, channel quality indicates).
For information feedback pattern based on PMI, detailed process is as follows: 1) eNB sends reference
Signal CRS or CSI-RS；2) UE carries out channel estimation according to CRS or CSI-RS, selects optimum
PMI also calculates corresponding CQI, UE feedback CQI and PMI.
For information feedback pattern based on transmission diversity, leading between complete eNB and UE
A kind of implementation method of letter flow journey is as shown in Figure 1:
1) UE calculates CQI according to reference signal；
The typical method that UE calculates CQI is as follows:
A) UE carries out channel estimation according to CRS or CSI-RS, it is thus achieved that the channel H on certain subcarrier descending；
B) energy of UE estimation useful signal is S=Ptxtr(HHH), wherein, S represents the energy of useful signal,
PtxFor the signal transmitting power of base station, tr (x) is the mark of matrix x；
C) UE calculates the power of interference signal according to the average interference Correlation Matrix on this carrier wave；
Wherein, Interf is the power of interference signal, NRFor the number of terminal reception antenna, CovR is one section
Sliding average in time window；
D) CQI of UE estimation is:
Wherein, SINR is signal to noise ratio, and Noise is noise power；
2) UE feedback CQI is to eNB；
3) eNB dispatches UE and calculates wave beam formed matrix, for multiuser MIMO (multiple-input and multiple-output)
It is also performed to user's pairing；
4) eNB is that UE determines MCS (Modulation and Coding Scheme, modulation and coding strategy)
And carry out data transmission；
5) UE carries out Data Detection.
But in existing TD-LTE system there be the information feedback of transmission means based on channel reciprocity
Following technical problem:
One, LTE standard define only the transmission diversity transmission mode of 2 ports and 4 ports, when base station is adopted
During with 8 antenna, need CRS or CSI-RS that 8 antenna mappings are 2/4 port.
1) information feedback is carried out if based on CRS, in order to ensure the covering of CCCH,
The half-power beam width of CRS is the most relatively wide, needs to cover all users of this community, and by many
Antenna mapping is to can frequently result in power loss during the CRS of 2/4 port, and this can reduce the covering power of CRS.
After 3D-MIMO (3-dimensional multiple-input and multiple-output) antenna, antenna number becomes more, not only
Level dimension has many antennas, and vertical dimension also has many antennas, in order to allow CRS also have necessarily in vertical dimension
Beam angle with ensure cover, power loss can be bigger.
2) carrying out information feedback if based on CSI-RS, antenna reflects to 2/4 port CSI-RS's
Penetrate and depend on implementing, if only 2/4 transmission antenna being mapped as 2/4 port CSI-RS, then power
Relatively low, cover and be likely to become problem；If by the CSI-RS that many antenna mappings are 2/4 port, can relate to again
And to the problem how to map.
Two, current, terminal major part has two reception antennas, but only supports 1 transmission antenna, this meeting
The CQI bringing following problem: UE to calculate and to feed back has reacted channel status and the interference feelings of 2 reception antennas
Condition, and eNB can only estimate, by SRS, the down channel that 1 reception antenna is corresponding, finally sends data
Time use MCS have both comprehensively to determine, therefore, both do not mate the MCS that eNB will be caused to determine
Inaccuracy increases.
If eNB configuration UE uses information feedback mode based on PMI, due to 3D-MIMO
In be designed into multiple antenna configurations and multiple TXRU (transceiver channel) mapping mode, design codebooks can be very
Complexity, and it is difficult to have code book can meet this demand simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of information feedback, device, end
End and base station, in order to solve in TD-LTE system, the CQI feedback mode of existing antenna, power consumption
Greatly, and the problem that has single transmission antenna in inapplicable terminal.
In order to solve above-mentioned technical problem, the embodiment of the present invention provides a kind of method of information feedback,
Including:
Obtain the reference information that base station sends；
According to described reference information, obtain the Sounding Reference Signal SRS transmission antenna of terminal and described base
Channel transfer matrices between the port that the described reference information stood is corresponding；
According to described channel transfer matrices, obtain under base station is in maximum-ratio combing transmission mode, described SRS
The channel quality indicator (CQI) of transmission antenna；
Transmission feeds back to described base station, including at least described CQI in described feedback information.
Further, described reference information is channel state information reference signals CSI-RS, and described port is
At least one CSI-RS port.
Further, described according to described reference information, obtain the transmission antenna of terminal and the institute of described base station
State the channel transfer matrices between the port that reference information is corresponding, particularly as follows:
According to the transmission cycle of described CSI-RS, send out on the time-frequency location of instruction in CSI-RS configuration information
The CSI-RS sent measures, it is thus achieved that the SRS transmission antenna of terminal and the CSI-RS port of described base station it
Between channel transfer matrices.
Further, described maximum-ratio combing transmission mode is:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Regulation is under described maximum-ratio combing transmission mode, and terminal only has single antenna；
According to known NTChannel transfer matrices between individual CSI-RS port and the SRS transmission antenna of terminal,
According to formula: P=H*Acquire the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
Further, described according to described channel transfer matrices, obtain and be in maximum-ratio combing transmission in base station
Under pattern, the channel quality indicator (CQI) of described SRS transmission antenna, specifically include:
Under maximum-ratio combing transmission mode, according to pre-coding matrix and described channel transfer matrices, obtain institute
State the signal to noise ratio of SRS transmission antenna；
Described signal to noise ratio is quantified, acquires the channel quality indicator (CQI) of described SRS transmission antenna.
Further, described according to pre-coding matrix with described channel transfer matrices, obtain described SRS and send
The signal to noise ratio of antenna, specifically includes:
According to described pre-coding matrix, described channel transfer matrices and the transmit power of signal, it is calculated
The power of useful signal；
Power according to described useful signal and terminal experienced interference power, be calculated described SRS and send out
The signal to noise ratio of antennas.
Further, when described terminal has a SRS transmission antenna, described feedback information only comprises institute
Stating CQI, correspondingly, described transmission feeds back to described base station, particularly as follows:
Send described CQI to described base station；
When described terminal has at least two SRS transmission antenna, described feedback information comprise described CQI with
And represent the label information of the corresponding relation of described CQI and described SRS transmission antenna, correspondingly, described
Send and feed back to described base station, particularly as follows:
Send described CQI and represent the labelling letter of described CQI and the corresponding relation of described SRS transmission antenna
Breath is to described base station.
The embodiment of the present invention provides the device of a kind of information feedback, including:
First acquisition module, for obtaining the reference information that base station sends；
Second acquisition module, for according to described reference information, obtaining the Sounding Reference Signal SRS of terminal
Channel transfer matrices between the port that transmission antenna is corresponding with the described reference information of described base station；
3rd acquisition module, for according to described channel transfer matrices, obtains and is in maximum-ratio combing in base station
Under transmission mode, the channel quality indicator (CQI) of described SRS transmission antenna；
Feedback module, feeds back to described base station for transmission, including at least described in described feedback information
CQI。
Further, described reference information is channel state information reference signals CSI-RS, and described port is
At least one CSI-RS port.
Further, described maximum-ratio combing transmission mode is:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Regulation is under described maximum-ratio combing transmission mode, and terminal only has single antenna；
According to known NTChannel transfer matrices between individual CSI-RS port and the SRS transmission antenna of terminal,
According to formula: P=H*Acquire the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
Further, described 3rd acquisition module includes:
First obtains submodule, under maximum-ratio combing transmission mode, according to pre-coding matrix and described
Channel transfer matrices, obtains the signal to noise ratio of described SRS transmission antenna；
Second obtains submodule, for described signal to noise ratio being quantified, acquires described SRS and sends sky
The channel quality indicator (CQI) of line.
Further, described first acquisition submodule specifically includes:
First computing unit, for according to described pre-coding matrix, described channel transfer matrices and signal
Transmit power, is calculated the power of useful signal；
Second computing unit, for the power according to described useful signal and terminal experienced interference power,
It is calculated the signal to noise ratio of described SRS transmission antenna.
Further, when described terminal has a SRS transmission antenna, described feedback information only comprises institute
State CQI, correspondingly, described feedback module particularly as follows:
Send described CQI to described base station；
When described terminal has at least two SRS transmission antenna, described feedback information comprise described CQI with
And represent the label information of the corresponding relation of described CQI and described SRS transmission antenna, correspondingly, described instead
Feedback module particularly as follows:
Send described CQI and represent the labelling letter of described CQI and the corresponding relation of described SRS transmission antenna
Breath is to described base station.
The embodiment of the present invention provides a kind of terminal, including the device of above-mentioned information feedback.
The embodiment of the present invention provides a kind of method of information feedback, is applied to base station side, including:
Send reference information so that terminal is visited according to the described reference information received, the channel obtaining terminal
Survey the channel between the port that reference signal SRS transmission antenna is corresponding with the described reference information of described base station to pass
Defeated matrix, and under base station is in maximum-ratio combing transmission mode, calculate according to described channel transfer matrices
After the channel quality indicator (CQI) arrived, transmission feeds back to base station including at least described CQI's；
Receive and parse through described feedback information, obtain the SRS transmission antenna corresponding for described CQI received.
The embodiment of the present invention provides a kind of base station, including:
Sending module, is used for sending reference information so that terminal, according to the described reference information received, obtains
Take the end that the Sounding Reference Signal SRS transmission antenna of terminal is corresponding with the described reference information of described base station
Channel transfer matrices between Kou, and under base station is in maximum-ratio combing transmission mode, according to described channel
After the calculated channel quality indicator (CQI) of transmission matrix, send the feedback information including at least described CQI
To base station；
Parsing module, is used for receiving and parsing through described feedback information, and the described CQI obtaining receiving is corresponding
SRS transmission antenna.
The invention has the beneficial effects as follows:
Such scheme, by assuming that base station uses maximum-ratio combing transmission mode, obtains under this transmission mode
The CQI of antenna, it is ensured that the accuracy of CQI, this kind of mode, reduce power loss, support base simultaneously
Stand more port number, because with end side, the CQI of terminal feedback supports that the antenna that SRS sends is corresponding, it is ensured that
The accuracy of the CQI that base station receives.
Accompanying drawing explanation
Fig. 1 represents in prior art, based on send diversity information feedback pattern under, base station with
The schematic flow sheet of terminal called；
Fig. 2 represents the overview flow chart of the method for the described information feedback of the embodiment of the present invention；
Fig. 3 represents the module diagram of the device of the described information feedback of the embodiment of the present invention；
Fig. 4 represents the base station based on maximum-ratio combing transmission mode of the embodiment of the present invention and the stream of terminal called
Journey schematic diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing and specifically real
Execute example to describe the present invention.
The present invention is directed in TD-LTE system, the CQI feedback mode of existing antenna, power consumption is big,
And inapplicable terminal has the problem of single transmission antenna, as shown in Figure 2, it is provided that a kind of channel condition information
The method of feedback, including:
Step 10, obtains the reference information that base station sends；
Step 20, according to described reference information, obtains the Sounding Reference Signal SRS transmission antenna of terminal
Channel transfer matrices port between corresponding with the described reference information of described base station；
Step 30, according to described channel transfer matrices, obtains under base station is in maximum-ratio combing transmission mode,
The channel quality indicator (CQI) of described SRS transmission antenna；
Step 40, sends and feeds back to described base station, including at least described CQI in described feedback information.
It should be noted that described SRS transmission antenna refers to the antenna supporting SRS to send in terminal.
It should be noted that, in the above embodiment of the present invention, when carrying out CQI feedback, Main Basis be
CSI-RS, i.e. reference information described in step 10 are CSI-RS；According to the configuring condition of base station, base station
It is configured with several CSI-RS port, then sends the CSI-RS information of several port, it is not necessary to held by antenna
Mouth maps, and reduces the transmission complexity of CSI-RS information.
Specifically, described step 20 particularly as follows:
According to the transmission cycle of described CSI-RS, send out on the time-frequency location of instruction in CSI-RS configuration information
The CSI-RS sent measures, it is thus achieved that the channel between SRS transmission antenna and the port of described base station of terminal
Transmission matrix.
It is only the illustration of a kind of implementation to step 20 it should be noted that, above-mentioned, described basis
CSI-RS obtains the channel transfer matrices between SRS transmission antenna and the CSI-RS port of base station of terminal
Method is any technique commonly known, is no longer described in detail at this.
This programme mainly hypothesis base station is under maximum-ratio combing transmission mode, and terminal carries out channel condition information
Feedback, described maximum-ratio combing transmission mode (MRT Precoding Scheme) is specifically defined as:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Assume that terminal only has single antenna under described maximum-ratio combing transmission mode, according to known NTIndividual
Channel transfer matrices between the SRS transmission antenna of CSI-RS port and terminal, according to formula: P=H*Obtain
Obtain the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
According to above-mentioned definition, based on above-mentioned maximum-ratio combing transmission mode, described step 30 specifically includes:
Step 31, under maximum-ratio combing transmission mode, according to pre-coding matrix and described channel transfer matrices,
Obtain the signal to noise ratio of described SRS transmission antenna；
Step 32, quantifies described signal to noise ratio, acquires the channel quality of described SRS transmission antenna
Instruction CQI.
The specific implementation of the described step 31 of the embodiment of the present invention is:
According to described pre-coding matrix, described channel transfer matrices and the transmit power of signal, it is calculated
The power of useful signal；
Power according to described useful signal and terminal experienced interference power, be calculated described SRS and send out
The signal to noise ratio of antennas.
It is alternatively possible to according to formula: P0=Ptr× P × H is calculated the power of useful signal；Wherein,
P0Power for useful signal；PtrTransmit power for signal；
Then formula: SINR=P is utilized0/P1It is calculated the signal to noise ratio of described SRS transmission antenna；Wherein,
SINR is the signal to noise ratio of SRS transmission antenna；P1For terminal experienced interference power.
It should be noted that, after the signal to noise ratio obtaining SRS transmission antenna, by described signal to noise ratio is carried out
Quantify, according to default mapping relations, described signal to noise ratio is converted into the CQI of correspondence.
It should be noted that, terminal is when carrying out information feedback, if terminal only has one to support SRS
Send antenna, then its transmission comprises the base station that feeds back to of described CQI, base station receive described instead
Then giving tacit consent to the CQI received after feedforward information is antenna corresponding to described terminal；And when there is multiple support SRS base station
During the antenna sent, because terminal can be calculated the CQI of each SRS transmission antenna respectively, and terminal with
Base station, when the information of carrying out is fed back, can send the CQI of these SRS transmission antennas, in turn without other
Additional information distinguish these CQI, terminal can be made when receiving CQI, it is not known that the CQI received
Which SRS transmission antenna corresponding is on earth, thus base station can be caused to process the inaccuracy of other information,
In order to solve this kind of problem, if terminal has at least two antennas supporting SRS to send, then it needs transmission
Feedback information not only to comprise described CQI, also to comprise the right of described CQI and described SRS transmission antenna
The label information that should be related to, base station is after receiving described feedback information, by described feedback information
Label information resolves, just can obtain described CQI corresponding be which SRS transmission antenna on earth.
Such scheme, by assuming that base station uses maximum-ratio combing transmission mode, obtains under this transmission mode
The CQI of antenna, it is ensured that the accuracy of CQI, this kind of mode, reduce power loss, support base simultaneously
Stand more port number, because with end side, the CQI of terminal feedback supports that the antenna that SRS sends is corresponding, it is ensured that
The accuracy of the CQI that base station receives.
Corresponding to said method, as it is shown on figure 3, the embodiment of the present invention to also provide for a kind of channel condition information anti-
The device of feedback, including:
First acquisition module 100, for obtaining the reference information that base station sends；
Second acquisition module 200, for according to described reference information, obtaining the Sounding Reference Signal of terminal
Channel transfer matrices between the port that SRS transmission antenna is corresponding with the described reference information of described base station；
3rd acquisition module 300, for according to described channel transfer matrices, obtains and is in high specific conjunction in base station
And under transmission mode, the channel quality indicator (CQI) of described SRS transmission antenna；
Feedback module 400, feeds back to described base station for transmission, including at least institute in described feedback information
State CQI.
Specifically, described reference information is channel state information reference signals CSI-RS, and described port be to
A few CSI-RS port.
It should be noted that described maximum-ratio combing transmission mode is:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Regulation is under described maximum-ratio combing transmission mode, and terminal only has single antenna；
According to known NTChannel transfer matrices between individual CSI-RS port and the SRS transmission antenna of terminal,
According to formula: P=H*Acquire the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
Alternatively, described 3rd acquisition module 300 includes:
First obtains submodule, under maximum-ratio combing transmission mode, according to pre-coding matrix and described
Channel transfer matrices, obtains the signal to noise ratio of described SRS transmission antenna；
Second obtains submodule, for described signal to noise ratio being quantified, acquires described SRS and sends sky
The channel quality indicator (CQI) of line.
Further, described first acquisition submodule specifically includes:
First computing unit, for according to described pre-coding matrix, described channel transfer matrices and signal
Transmit power, is calculated the power of useful signal；
Second computing unit, for the power according to described useful signal and terminal experienced interference power,
It is calculated the signal to noise ratio of described SRS transmission antenna.
Alternatively, described first computing unit implementation is:
According to formula: P0=Ptr× P × H is calculated the power of useful signal；Wherein,
P0Power for useful signal；PtrTransmit power for signal.
The implementation of described second computing unit is:
Utilize formula: SINR=P0/P1It is calculated the signal to noise ratio of described SRS transmission antenna；Wherein,
SINR is the signal to noise ratio of SRS transmission antenna；P1For terminal experienced interference power.
In further embodiment of this invention, when described terminal has a SRS transmission antenna, described feedback letter
Breath only comprise described CQI, the most described feedback module particularly as follows:
Send described CQI to described base station；
When described terminal has at least two SRS transmission antenna, described feedback information comprise described CQI with
And represent the label information of the corresponding relation of described CQI and described SRS transmission antenna, the most described feedback module
Particularly as follows:
Send described CQI and represent the labelling letter of described CQI and the corresponding relation of described SRS transmission antenna
Breath is to described base station.
It should be noted that this device embodiment is the device corresponding with said method, the institute of said method
There is implementation all be applicable to this device embodiment, also can reach technique effect same as mentioned above.
The embodiment of the present invention provides a kind of terminal, including the device of above-mentioned information feedback.
The embodiment of the present invention provides a kind of method of information feedback, is applied to base station side, including:
Send reference information so that terminal is visited according to the described reference information received, the channel obtaining terminal
Survey the channel between the port that reference signal SRS transmission antenna is corresponding with the described reference information of described base station to pass
Defeated matrix, and under base station is in maximum-ratio combing transmission mode, calculate according to described channel transfer matrices
After the channel quality indicator (CQI) arrived, transmission feeds back to base station including at least described CQI's；
Receive and parse through described feedback information, obtain the SRS transmission antenna corresponding for described CQI received.
The embodiment of the present invention provides a kind of base station, including:
Sending module, is used for sending reference information so that terminal, according to the described reference information received, obtains
Take the end that the Sounding Reference Signal SRS transmission antenna of terminal is corresponding with the described reference information of described base station
Channel transfer matrices between Kou, and under base station is in maximum-ratio combing transmission mode, according to described channel
After the calculated channel quality indicator (CQI) of transmission matrix, send the feedback information including at least described CQI
To base station；
Parsing module, is used for receiving and parsing through described feedback information, and the described CQI obtaining receiving is corresponding
SRS transmission antenna.
It should be noted that, described base station is according to the feedback information of terminal, the CQI obtaining receiving can be resolved
It is the corresponding CQI of which antenna of terminal, it is ensured that receive the accuracy of information.
As shown in Figure 4, when described terminal has two antennas supporting SRS to send, and the CSI-RS of base station
Port number when being 8, the flow process carrying out information feedback between described terminal and base station is:
1, eNB sends the CSI-RS reference signal of 8 ports；
2, UE carries out channel estimation according to the CSI-RS received, and the 1st SRS obtaining UE sends sky
Channel transfer matrices between line and 8 CSI-RS ports is H (matrix dimension is 1 × 8), and UE assumes
ENB uses the pre-coding matrix of maximum-ratio combing transmission mode, according to formula P0=Ptr× P × H is calculated
The power of useful signal；Then acquiring terminal experienced interference power is P1(it should be noted that eventually
End experienced interference power can be the 1st SRS transmission antenna experienced interference, it is also possible to is multiple skies
The average interference that line is subject to), utilize formula S INR=P0/P1Obtain the signal to noise ratio of the 1st SRS transmission antenna,
Then according to mapping relations set in advance change the signal to noise ratio of the 1st SRS transmission antenna, just may be used
Obtain the CQI of the 1st SRS transmission antenna；Obtain the 2nd SRS transmission antenna according to above-mentioned steps simultaneously
CQI；
3, before carrying out CQI feedback, described terminal first has to generate the label information of each CQI, this mark
The corresponding relation between this CQI and SRS transmission antenna is had described in note information；Then terminal is by this CQI
And the label information of this CQI feeds back to base station, base station, according to the feedback information received, resolves,
Just the SRS transmission antenna corresponding for CQI received can be obtained.
Present invention information feedback based on maximum-ratio combing transmission mode scheme, compares based on transmission
Diversity and information feedback scheme based on PMI, have no power loss, can support unnecessary 8
The base station of port, and adapt to multiple antenna configurations, could be applicable to terminal single antenna and send the situation of SRS,
Concrete relative analysis is as shown in table 1:
13 kinds of information feedback scheme comparison's analytical tables of table
It should be noted that, the present invention can support more CSI-RS port number flexibly, it is not merely limited to make
CSI-RS with 2/4 port；Traditional UE only feeds back a CQI based on many reception antennas, this
CQI with the UE end of bright middle UE feedback supports that the antenna that SRS sends is corresponding, is more suitable for only support section
Antenna sends the situation of SRS.
Above-described is the preferred embodiment of the present invention, it should be pointed out that for the ordinary people of the art
For Yuan, some improvements and modifications can also be made under without departing from principle premise of the present invention, these
Improvements and modifications are the most within the scope of the present invention.
Claims (16)
1. the method for an information feedback, it is characterised in that including:
Obtain the reference information that base station sends；
According to described reference information, obtain the Sounding Reference Signal SRS transmission antenna of terminal and described base
Channel transfer matrices between the port that the described reference information stood is corresponding；
According to described channel transfer matrices, obtain under base station is in maximum-ratio combing transmission mode, described SRS
The channel quality indicator (CQI) of transmission antenna；
Transmission feeds back to described base station, including at least described CQI in described feedback information.
Method the most according to claim 1, it is characterised in that described reference information is channel status letter
Cease reference signal CSI-RS, and described port is at least one CSI-RS port.
Method the most according to claim 2, it is characterised in that described according to described reference information, obtains
Take the channel transfer matrices between the port that the transmission antenna of terminal is corresponding with the described reference information of described base station,
Particularly as follows:
According to the transmission cycle of described CSI-RS, send out on the time-frequency location of instruction in CSI-RS configuration information
The CSI-RS sent measures, it is thus achieved that the SRS transmission antenna of terminal and the CSI-RS port of described base station it
Between channel transfer matrices.
Method the most according to claim 2, it is characterised in that described maximum-ratio combing transmission mode is:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Regulation is under described maximum-ratio combing transmission mode, and terminal only has single antenna；
According to known NTChannel transfer matrices between individual CSI-RS port and the SRS transmission antenna of terminal,
According to formula: P=H*Acquire the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
Method the most according to claim 4, it is characterised in that described according to described channel transfer matrices,
Obtain under base station is in maximum-ratio combing transmission mode, the channel quality indicator (CQI) of described SRS transmission antenna,
Specifically include:
Under maximum-ratio combing transmission mode, according to pre-coding matrix and described channel transfer matrices, obtain institute
State the signal to noise ratio of SRS transmission antenna；
Described signal to noise ratio is quantified, acquires the channel quality indicator (CQI) of described SRS transmission antenna.
Method the most according to claim 5, it is characterised in that described according to pre-coding matrix with described
Channel transfer matrices, obtains the signal to noise ratio of described SRS transmission antenna, specifically includes:
According to described pre-coding matrix, described channel transfer matrices and the transmit power of signal, it is calculated
The power of useful signal；
Power according to described useful signal and terminal experienced interference power, be calculated described SRS and send out
The signal to noise ratio of antennas.
Method the most according to claim 5, it is characterised in that send out when described terminal has a SRS
During antennas, described feedback information only comprises described CQI, and correspondingly, described transmission feeds back to described
Base station, particularly as follows:
Send described CQI to described base station；
When described terminal has at least two SRS transmission antenna, described feedback information comprise described CQI with
And represent the label information of the corresponding relation of described CQI and described SRS transmission antenna, correspondingly, described
Send and feed back to described base station, particularly as follows:
Send described CQI and represent the labelling letter of described CQI and the corresponding relation of described SRS transmission antenna
Breath is to described base station.
8. the device of an information feedback, it is characterised in that including:
First acquisition module, for obtaining the reference information that base station sends；
Second acquisition module, for according to described reference information, obtaining the Sounding Reference Signal SRS of terminal
Channel transfer matrices between the port that transmission antenna is corresponding with the described reference information of described base station；
3rd acquisition module, for according to described channel transfer matrices, obtains and is in maximum-ratio combing in base station
Under transmission mode, the channel quality indicator (CQI) of described SRS transmission antenna；
Feedback module, feeds back to described base station for transmission, including at least described in described feedback information
CQI。
Device the most according to claim 8, it is characterised in that described reference information is channel status letter
Cease reference signal CSI-RS, and described port is at least one CSI-RS port.
Device the most according to claim 9, it is characterised in that described maximum-ratio combing transmission mode
For:
Definition Y=PX；Wherein,
X is single current signal before precoding, and matrix dimension is 1 × 1；Y is the signal after precoding, square
Battle array dimension is NT× 1, wherein NTNumber for CSI-RS port；P is pre-coding matrix；
Regulation is under described maximum-ratio combing transmission mode, and terminal only has single antenna；
According to known NTChannel transfer matrices between individual CSI-RS port and the SRS transmission antenna of terminal,
According to formula: P=H*Acquire the pre-coding matrix under described maximum-ratio combing transmission mode；Wherein,
Described channel transfer matrices is designated as H, and its matrix dimension is 1 × NT；H*For described channel transfer matrices
Adjoint matrix.
11. devices according to claim 10, it is characterised in that described 3rd acquisition module includes:
First obtains submodule, under maximum-ratio combing transmission mode, according to pre-coding matrix and described
Channel transfer matrices, obtains the signal to noise ratio of described SRS transmission antenna；
Second obtains submodule, for described signal to noise ratio being quantified, acquires described SRS and sends sky
The channel quality indicator (CQI) of line.
12. devices according to claim 11, it is characterised in that described first acquisition submodule is concrete
Including:
First computing unit, for according to described pre-coding matrix, described channel transfer matrices and signal
Transmit power, is calculated the power of useful signal；
Second computing unit, for the power according to described useful signal and terminal experienced interference power,
It is calculated the signal to noise ratio of described SRS transmission antenna.
13. devices according to claim 11, it is characterised in that when described terminal has a SRS
During transmission antenna, described feedback information only comprises described CQI, correspondingly, described feedback module particularly as follows:
Send described CQI to described base station；
When described terminal has at least two SRS transmission antenna, described feedback information comprise described CQI with
And represent the label information of the corresponding relation of described CQI and described SRS transmission antenna, correspondingly, described instead
Feedback module particularly as follows:
Send described CQI and represent the labelling letter of described CQI and the corresponding relation of described SRS transmission antenna
Breath is to described base station.
14. 1 kinds of terminals, it is characterised in that include the channel shape as described in any one of claim 8 to 13
The device of state information feedback.
The method of 15. 1 kinds of information feedbacks, is applied to base station side, it is characterised in that including:
Send reference information so that terminal is visited according to the described reference information received, the channel obtaining terminal
Survey the channel between the port that reference signal SRS transmission antenna is corresponding with the described reference information of described base station to pass
Defeated matrix, and under base station is in maximum-ratio combing transmission mode, calculate according to described channel transfer matrices
After the channel quality indicator (CQI) arrived, transmission feeds back to base station including at least described CQI's；
Receive and parse through described feedback information, obtain the SRS transmission antenna corresponding for described CQI received.
16. 1 kinds of base stations, it is characterised in that including:
Sending module, is used for sending reference information so that terminal, according to the described reference information received, obtains
Take the end that the Sounding Reference Signal SRS transmission antenna of terminal is corresponding with the described reference information of described base station
Channel transfer matrices between Kou, and under base station is in maximum-ratio combing transmission mode, according to described channel
After the calculated channel quality indicator (CQI) of transmission matrix, send the feedback information including at least described CQI
To base station；
Parsing module, is used for receiving and parsing through described feedback information, and the described CQI obtaining receiving is corresponding
SRS transmission antenna.
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| PCT/CN2016/078577 WO2016161936A1 (en) | 2015-04-07 | 2016-04-06 | Channel state information feedback method, apparatus, terminal, and base station |
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| WO2016161936A1 (en) | 2016-10-13 |
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