CN104184537A - Channel information feedback method and device in mobile communication system - Google Patents
Channel information feedback method and device in mobile communication system Download PDFInfo
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Abstract
The invention proposes a method for channel state information feedback of a large-scale multi-input-multi-output (MIMO) system. In one embodiment, the method includes the following steps: a piece of UE detects a plurality of downlink reference signal ports and feeds back indexes of part of reference signal ports which are better in channel quality so as to assist in uplink reception precoding operations. Through use of the method and device, a problem of CSI feedback in a Massive MIMO system is solved and through support of uplink reception precoding, a problem of pilot-frequency pollution is prevented and moreover, a calculation complexity needed by uplink channel estimation is reduced significantly and at the same time, compatability with an existing system is maintained to the largest degree.
Description
Draw art field
The present invention relates to the scheme of feedback of channel information in mobile communication technology field, particularly relate to the descending channel information feedback scheme in the mobile communication system that has adopted extensive Multiinputoutput (Massive MIMO-Massive Multiple Input Multiple Output) technology.
Background technology
In traditional third generation partner program (3GPP-3rd Generation Partner Project) Long Term Evolution (LTE-Long Term Evolution) system, the CSI feedback of mimo channel mainly contains two kinds of modes
● feedback implicit expression CSI
Subscriber equipment (UE-User Equipment) is by the specific reference signal in detected cells (CRS-Cell specific Reference Signal) or channel status instruction reference signal CSI-RS:CSI Reference Signal) obtain channel impulse response CIR-Channel Impulse Response) and be mapped as implicit expression CSI, comprise the information such as pre-coding matrix instruction (Precoding Matrix Indicator).The PMI that system side is fed back by UE obtains the spatial coherence of MIMO down channel.
Accompanying drawing 1 is the CSI-RS pattern based on normal cyclic prefix (Normal CP-Normal Cyclic Prefix) in an existing LTE system-simultaneously indicated CRS and demodulated reference signal (DMRS-Demodulation Reference Signal), and one of them lattice is least resource unit-resource particle (RE-Resource Element) of LTE.The RE that oblique line indicates can be for sending CSI-RS.LTE system adopts the concept definition RS resource of port: a RS port may be mapped to a physical antenna, is likely also that many physical antennas are superposeed and formed a virtual antenna by merging.
LTE has defined 3 kinds of CSI-RS port numbers: 2,4,8, and indicated digital RE example in the accompanying drawing 1 pattern example of one group of 8CSI-RS port, numeral port index.
● feeding back uplink interception reference signal (SRS-Sounding Reference Signal)
UE sends uplink SRS, and system side obtains up channel CSI by demodulation SRS, then obtains descending CSI according to link symmetry.The method is mainly applicable to time division duplex (TDD-Time Duplex Division) system.
As a kind of new Cellular Networks antenna frame, Massive MIMO becomes a study hotspot recently.Thereby the typical feature of Massive mimo system is the quantity by increasing antenna array unit obtains a series of gains to larger value, and for example, power system capacity continues to increase along with the increase of antenna amount in theory; The coherent superposition of transmitting antenna signal reduces transmitting power etc.The challenge that MassiveMIMO faces is how to guarantee that transmitting terminal obtains channel status instruction (CSI-Channel Status Indicator) information accurately.
About Massive MIMO, main research is based on TDD system at present, and utilizing SRS and link symmetry is that system side obtains descending CSI.Consider actual deployment scene, still have following problem to need to solve:
1. pilot pollution-can be subject to the interference of other SRS sequences to the channel estimating of target SRS, especially comes from the CIR that the interference of the nonopiate SRS of neighbor cell estimates system side and has comprised the interference components that points to adjacent area UE, forms presence of intercell interference.
2. the antenna amount of complexity-Massive mimo system may reach hundreds of more than, and each root antenna all independently estimates CIR needs a large amount of computation complexities.
3. Frequency Division Duplexing (FDD) (FDD-Frequency Division Duplex) system CSI feedback-FDD system is still the Cellular Networks deployment scheme of main flow at present, and in order to ensure the smooth evolution of FDD, the Massive MIMO CSI feedback in FDD scene still needs effective solution.
Summary of the invention
The invention discloses a kind of method communicating in subscriber equipment (UE) of multi-input multi-output system, wherein, comprise the steps:
The downlink reference signal of S port of-reception
-select N port in a described S port for bandwidth F
-feedback beam selection vector (BSV-Beam Selection Vector) pointer is to the N of a bandwidth F port
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.Described S is configured by high level or physical layer signaling, described N is by high level or physical layer signaling configuration or predetermined configuration, described N is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth, by high level or physical layer signaling configuration or predetermined configuration.
Concrete, according to an aspect of the present invention, it is characterized in that, each port in a described N port is than not having a recommended S-N port to have higher link-quality in described bandwidth F, and described link-quality obtains by detecting one of at least following parameter:
Mean receiving power E in the resource particle (RE) of-described downlink reference signal in described bandwidth F
rsrp
-described E
rsrpdivided by the mean receiving power E in the resource particle (RE) of OFDM (OFDM-Orthogonal Frequency Division Multiplexing) symbol in described downlink reference signal place in described bandwidth F
rssithe ratio E obtaining
rsrq
Above-mentioned E
rsrphaving represented described Reference Signal Received Power (RSRP-Reference Signal Receiving Power), is the mean value that carries the signal power receiving on all RE of described reference signal; Above-mentioned E
rssirepresent the received signal strength indicator (RSSI-Received Signal Strength Indicator) of described reference signal place OFDM symbol, that all signals that receive in the OFDM symbol of described downlink reference signal place (comprise pilot signal and data-signal, adjacent area interference signal, noise signal etc.) mean value of power, above-mentioned E
rsrqabove-mentioned E
rsrpwith above-mentioned E
rssiratio.Described BSV feeds back by the mode that adopts S bit mapping, or passes through
the mode of the port index coding of individual bit to N instruction is fed back, wherein
represent to be not less than the smallest positive integral of X.
As one embodiment of the present of invention, it is 8 and the position of the downlink reference signal of corresponding 8 ports that UE obtains described S value by Radio Resource control (RRC-Radio Resource Control) signaling, described in predefine, N value is 4, and obtaining bandwidth F by dynamic signaling is a sub-bandwidth in system bandwidth.UE receives the downlink reference signal of 8 ports, calculates the described E of each port on described subband is wide
rsrpvalue, selects to have maximum described E in 8 ports
rsrpthe index of 4 ports of value, feeds back the index of described 4 ports by described BSV.Described BSV is the vector that 8 bits form, and wherein each bit is used to indicate a downlink reference signal port and whether belongs to one of described N downlink reference signal port.
As another embodiment of the present invention, it is 16 and the position of the downlink reference signal of corresponding 16 ports that UE obtains described S value by RRC signaling, and obtaining described N value by RRC signaling is 2, and described bandwidth F is predefined as system bandwidth.UE receives the downlink reference signal of 16 ports, calculates the described E of each port on a part of subband of system bandwidth is wide
rsrp, value, selects to have maximum described E in 16 ports
rsrpthe index of 2 ports of value carries out uplink feedback by described BSV.Described BSV is the vector that 8 bits form, and wherein every 4 bits are used to indicate a downlink port index.
Concrete, according to an aspect of the present invention, it is characterized in that, described downlink reference signal is through pre-encode operation, and the precoding vector that a wherein said N port is corresponding is respectively v
1v
2l v
n.
Pre-encode operation is that the column vector premultiplication precoding row vector of the physical antenna signal composition that will send becomes a downlink reference signal port, and concrete operation is completed by system side.The port number that pre-encode operation forms can be not equal to physical antenna quantity, for Massive mimo system, considers the resource overhead that reference signal is shared, and described S is generally less than physical antenna quantity.
As one embodiment of the present of invention, it is to carry out by 8 precoding vectors the logical antenna ports that precoding forms later by 128 physical antennas that UE receives 8 reference signal ports, and UE therefrom selects 4 antenna ports, instruction in up BSV feedback.
Concrete, according to an aspect of the present invention, it is characterized in that, also comprise the steps:
-feeding back uplink interception reference signal (SRS)
TDD system has apparent link symmetry, thereby the up channel CIR that can directly demodulation SRS be obtained is applied to downlink transfer.For FDD, due to upper and lower property frequency band differences, some statistical property of the channel obtaining according to SRS can be used to downlink transfer, the covariance matrix of for example channel.
Concrete, according to an aspect of the present invention, it is characterized in that, also comprise the steps:
-in described bandwidth F, select pre-coding matrix for a described N port to indicate (PMI);
-feed back described PMI
Select the standard of PMI to comprise maximum channel capacity or maximum Signal to Interference plus Noise Ratio (SINR-Signal to Interference Noise Ratio).
As one embodiment of the present of invention, the subscriber equipment u with k root reception antenna detects S downlink reference signal port, and indicate wherein N reference signal port by BSV, wherein said N reference signal port down channel matrix in described bandwidth F is the capable N column matrix of k H
k × N, described subscriber equipment u searches for the code word W of the capable r row of N in described bandwidth F with maximum channel capacity in predefined code book space
n × r, wherein r is precoding order number.Described subscriber equipment is by described W
n × rindex PMI feedback.
Concrete, according to an aspect of the present invention, it is characterized in that, the described downlink reference signal of each port is reused the pattern of channel status instruction reference signal (CSI-RS).
CSI feedback for mimo channel in LTE system realizes by demodulation CSI-RS, and therefore, described downlink reference signal can use CSI-RS resource, the RE that for example the CSI-RS resource of normal CP indicates as accompanying drawing 1 bend.Further, for compatible as far as possible existing protocol, described downlink reference signal pattern is reused existing CSI-RS pattern.The downlink reference signal port number of supporting is 2,4 or 8 ports.
As one embodiment of the present of invention, UE obtains and need to detect 8 downlink reference signal ports according to RRC signaling, described 8 reference signal port distribution, in a subframe (1 millisecond), are reused the CSI-RS pattern as the Digital ID in accompanying drawing 1, and wherein numeral is port index.
Concrete, according to an aspect of the present invention, it is characterized in that, the downlink reference signal of a described S port is mapped in K subframe, and described K is positive integer, and described K is by signal deployment.Described signaling can be high-level signaling, physical layer signaling or conceal signaling (being predefine K).
The physical antenna quantity of Massive mimo system is general far away exceedes the reference signal port number (subframe of LTE system can be held 8 CSI-RS ports) that a subframe can be held, and convert physical antenna to logical antenna and be mapped to the loss that a reference signal port in subframe can bring spatial degrees of freedom by the precoding vector of lesser amt, make UE can not choose the antenna port of optimum or suboptimum.Therefore, the downlink reference signal of a described S port can be mapped in K subframe, and K is positive integer, and the concrete numerical value of K is by signal deployment.
As one embodiment of the present of invention, UE detects 24 downlink reference signal ports, and described 24 port distribution are 3 subframes, 8 ports of each subframe, as shown in Figure 2.
Concrete, according to an aspect of the present invention, it is characterized in that, the observation window of described downlink reference signal passes through signal deployment.Above-mentioned signaling can be high-level signaling, physical layer signaling or conceal signaling (being predefine observation window length).
The observation window that configures described downlink reference signal by high level or physical layer signaling can further increase the corresponding precoding vector of downlink reference signal that UE can detect.UE detects the downlink reference signal port in described observation window, selects corresponding BSV, or corresponding PMI.By adopting different precoding vectors in different described observation windows, UE can detect the reference signal port of more precoding vector mapping within coherence time.Further, system side can be continued to optimize according to the BSV receiving and SRS or PMI the precoding vector of the downlink reference signal port that distributes UE.
As one embodiment of the present of invention, UE detects 40 downlink reference signal ports, and described 40 port distribution are 5 subframes, 8 ports of each subframe; The observation window that UE obtains described downlink reference signal according to RRC signaling is simultaneously 10 milliseconds (ms-milli-second)., for each port, in observation window 10ms, can send the downlink reference signal of twice, UE based on described twice transmission and select BSV and PMI.
The invention discloses a kind of method communicating in system equipment of multi-input multi-output system, wherein, comprise the steps:
The downlink reference signal an of-precoding S port
-send described downlink reference signal
-receive N the port obtaining in a described S port for the beam selection vector (BSV) of bandwidth F to indicate
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.Described S is configured by high level or physical layer signaling, described N is by high level or physical layer signaling configuration or predetermined configuration, described N is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth, by high level or physical layer signaling configuration or predetermined configuration.
Described system equipment includes but not limited to base station, relaying, Home eNodeB, the equipment such as microcellulor; Described signaling is high-level signaling or physical layer signaling.
Concrete, according to an aspect of the present invention, it is characterized in that, each port in a described N port has higher link-quality than the S-N not a being instructed to port in described bandwidth F, and described link-quality obtains by detecting one of at least following parameter:
Mean receiving power E in the resource particle (RE) of-described downlink reference signal in described bandwidth F
rsrp
-described E
rsrpmean receiving power E in resource particle (RE) divided by described downlink reference signal place OFDM (OFDM) symbol in described bandwidth F
rssithe ratio E obtaining
rsrq
Concrete, according to an aspect of the present invention, it is characterized in that, described downlink reference signal is through pre-encode operation, and the precoding vector that a wherein said N port is corresponding is respectively v
1v
2l v
n
As one embodiment of the present of invention, system equipment has 128 physical antennas, and the transmitted signal before precoding has formed the vectorial s that 128 row 1 are listed as
128 × 1, wherein each vector element is identical.System equipment is further selected 8 precoding vector v
1v
2l v
8, wherein each vector is that 1 row 128 is listed as, precoding vector is multiplied by respectively described s
128 × 1can obtain 8 logical antenna ports, each logical antenna ports is mapped to a downlink reference signal port.Described v
1v
2l v
8be that system equipment is realized relevant problem, typical precoding vector keeps orthogonal each other.But for Massive mimo system, random precoding vector also has the characteristic of near orthogonal.For the system equipment of outdoor deployment, for example 120 degree free spaces can be divided into multiple low-angles space that for example 15 degree cover, each precoding vector covers one of them low-angle space.The direct transmitted signal of physical antenna can be thought a kind of special precoding vector, the column vector that is listed as of 128 row 1 forming for 127 0 and 11, wherein 1 determining positions the physical antenna of transmitted signal.
Concrete, according to an aspect of the present invention, it is characterized in that, also comprise the steps:
-uplink sounding reference signal (SRS) that physical antenna is received is according to described v
1v
2l v
nexecution reception precoding obtains N and organizes equivalent SRS
-carry out channel estimating according to described equivalent SRS to obtain N group equivalent channel parameter
Above-mentioned equivalent channel parameter is the CIR between logical antenna and the UE of descending reference port representative, the parameters such as pre-coding matrix or covariance matrix.
As one embodiment of the present of invention, system side is carried out and is received precoding SRS signal, determine the good several wave beams of transmission quality according to the BSV receiving, then the SRS that receives is first carried out and receives precoding and obtain equivalent SRS according to corresponding precoding vector, more equivalent SRS is carried out channel estimating and obtained the CIR of described N group equivalent channel.Directly carry out channel estimating than every physical antenna of system side, the present embodiment has the following advantages:
Greatly reduce the implementation complexity of channel estimating
Strengthen the signal strength signal intensity that receives SRS, effectively avoided the problem of pilot pollution
Because having utilized link symmetry, the present embodiment is especially suitable for TDD system.
Concrete, according to an aspect of the present invention, it is characterized in that, also comprise the steps:
-receive the pre-coding matrix in described bandwidth F for a described N port to indicate (PMI)
-calculate equivalent channels information according to described BSV and described PMI
Above-mentioned equivalent channels information is the actual pre-coding matrix between system side equipment physical antenna and UE, the channel informations such as covariance matrix.
Be different from SRS, the feedback of PMI is applicable to FDD and TDD system.As one embodiment of the present of invention, system side is that a UE has configured 8 reference signal ports, obtains wherein 4 reference signal port index instructions by receiving BSV, and corresponding precoding vector is v
1v
2v
3v
4.Further, system side receives the pre-coding matrix W of PMI instruction
4 × rwherein r is the order of precoding.System side thinks that the actual pre-coding matrix of described UE in described bandwidth F is [v
1v
2v
3v
4] be multiplied by W
4 × r.
Concrete, according to an aspect of the present invention, it is characterized in that, the described downlink reference signal of each port is reused the pattern of channel status instruction reference signal (CSI-RS).
Concrete, according to an aspect of the present invention, it is characterized in that, the downlink reference signal of a described S port is mapped in K subframe, and described K is positive integer, and described K is configured by high level or physical layer signaling.
Concrete, according to an aspect of the present invention, it is characterized in that, the observation window of described downlink reference signal passes through signal deployment.Described signaling can be high-level signaling, physical layer signaling or conceal signaling (being predefine observation window length).
As one embodiment of the present of invention, system side configuration UE detects 64 downlink reference signal ports of 8 subframes, wherein 4 port indexs of feedback BSV instruction, and feed back corresponding PMI, and the observation window of downlink reference signal is 1ms described in system side predefine.System side is that 128 physical antennas have been selected 64 precoding vectors, in each subframe (1ms), uses 8 downlink reference signal ports, uses altogether 8 descending sub frames to travel through all 64 precoding vectors.System side obtains 4 equivalent pre-coding matrixes (Matrix Multiplication that the precoding vector of BSV instruction forms is with the pre-coding matrix of PMI instruction) that described UE optimizes in 64 spatial degrees of freedom in 8 subframes.
The invention also discloses a kind of subscriber equipment, comprising:
The first module: the downlink reference signal that receives S port;
The second module: select N port in a described S port for bandwidth F;
The 3rd module: feedback beam selection vector (BSV) pointer is to the N of a bandwidth F port.
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.Described S is configured by high level or physical layer signaling, described N is by high level or physical layer signaling configuration or predetermined configuration, described N is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth, by high level or physical layer signaling configuration or predetermined configuration.
As an embodiment, in the said equipment, also comprise:
Four module: feeding back uplink interception reference signal (SRS).
As another embodiment, in the said equipment, also comprise:
The 5th module: for a described N port is selected pre-coding matrix instruction (PMI) in described bandwidth F;
The 6th module: feed back described PMI
The invention also discloses a kind of network equipment, comprising:
The first module: the downlink reference signal of a precoding S port
The second module: send described downlink reference signal
The 3rd module: receive for the beam selection vector (BSV) of bandwidth F and obtain N port instruction in a described S port.
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.Described S is configured by high level or physical layer signaling, described N is by high level or physical layer signaling configuration or predetermined configuration, described N is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth, by high level or physical layer signaling configuration or predetermined configuration.
As an embodiment, in the said equipment, also comprise:
Four module: the uplink sounding reference signal (SRS) that physical antenna is received is according to described v
1v
2l v
nexecution reception precoding obtains N and organizes equivalent SRS.
The 5th module: carry out channel estimating according to described equivalent SRS and obtain N group equivalent channel parameter.
As another embodiment, in the said equipment, also comprise:
The 6th module: receive the instruction of the pre-coding matrix in described bandwidth F (PMI) for a described N port.
The 7th module: calculate equivalent channels information according to described BSV and described PMI.
The invention solves the problem of CSI feedback in Mass ive mimo system, avoid the problem of pilot pollution by supporting uplink receiving precoding, in addition greatly reduce the needed computation complexity of uplink channel estimation, at utmost kept the compatibility with existing system simultaneously.
Brief description of the drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows an example of the CSI-RS pattern of existing LTE system;
Fig. 2 shows downlink reference signal according to an embodiment of the invention and is mapped to the schematic diagram of multiple subframes;
Fig. 3 shows base station according to an embodiment of the invention and the mutual flow chart of UE;
Fig. 4 shows the structured flowchart of the processing unit for UE according to an embodiment of the invention;
Fig. 5 shows the structured flowchart of the processing unit for base station according to an embodiment of the invention;
Embodiment
Below in connection with accompanying drawing, technical scheme of the present invention is described in further detail, it should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine arbitrarily mutually.
Embodiment 1
Embodiment 1 is the mutual flow chart of base station and UE, as shown in Figure 3.In accompanying drawing 3, the port number N of downlink reference signal port S and corresponding pattern and BSV instruction is by signal deployment.
Base station equipment D100 carries out pre-encode operation to the downlink reference signal of S port in step S101, in step S102, the downlink reference signal of a described S port is sent to UE equipment D200.UE equipment D200 receives the downlink reference signal in the system bandwidth of a described S port in step S201, then in step S202, is chosen in N the port in system bandwidth with better transmission quality, then in step S203, feeds back BSV.Base station equipment D100 receives BSV in step S103.UE equipment D200 feeds back SRS in step S204, and base station equipment D100 receives precoding according to the precoding vector of BSV instruction port to SRS and obtains N and organize equivalent SRS in step S104, then in step S105, equivalent SRS is carried out to channel estimating.
It should be noted that, step S203 and step S204 do not have strict sequential relationship, because step S204 can serve other objects simultaneously, and for example uplink scheduling, step S204 can be transmission or the aperiodic transmission in cycle.
Embodiment 2
Embodiment 2 is the structured flowcharts for the processing unit of UE, as shown in Figure 4.In accompanying drawing 4, UE device 300 is by receiving system 301, choice device 302, and dispensing device 303 forms.Wherein receiving system 301 receives the downlink reference signal of S port, and choice device 302 is selected N the port with better channel quality according to RSRP or RSRQ, and dispensing device 303 sends the BSV of the described N of an instruction port index.
Embodiment 3
Embodiment 3 is the structured flowcharts for the processing unit of UE, as shown in Figure 4.In accompanying drawing 4, UE device 300 is by receiving system 301, choice device 302, and dispensing device 303 forms.Wherein receiving system 301 receives the downlink reference signal of S port, choice device 302 is selected N the port with better channel quality according to RSRP or RSRQ, further select the PMI of a described N port according to maximum channel capacity criterion, dispensing device 303 sends BSV and the described PMI of the described N of an instruction port index.
Embodiment 4
Embodiment 4 is the structured flowcharts for the processing unit of base station (eNB), as shown in Figure 5.In accompanying drawing 5, eNB device 400 is by operating means 401, dispensing device 402, and receiving system 403, calculation element 404 forms.The wherein reference signal precoding of operating means 401 to S port, dispensing device 402 sends described reference signal, receiving system 403 receives N port PMI of BSV and described BSV instruction, and calculation element 404 forms according to described BSV and described PMI recovery place equivalent channels information.
One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, described program can be stored in computer-readable recording medium, as read-only memory, and hard disk or CD etc.Optionally, all or part of step of above-described embodiment also can realize with one or more integrated circuit.Accordingly, the each modular unit in above-described embodiment, can adopt example, in hardware to realize, and also can be realized by the form of software function module, and the application is not limited to the combination of the software and hardware of any particular form.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, to make any amendments, are equal to replacement, improve etc., within all should being included in protection scope of the present invention.
Claims (20)
1. the method communicating in the subscriber equipment of multi-input multi-output system (UE), wherein, comprises the steps:
The downlink reference signal of S port of-reception
-select N port in a described S port for bandwidth F
-feedback beam selection vector (BSV) pointer is to the N of a bandwidth F port
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.
2. method according to claim 1, it is characterized in that, each port in a described N port is than not having a recommended S-N port to have higher link-quality in described bandwidth F, and described link-quality obtains by detecting one of at least following parameter:
Mean receiving power E in the resource particle (RE) of-described downlink reference signal in described bandwidth F
rsrp
-described E
rsrpmean receiving power E in resource particle (RE) divided by described downlink reference signal place OFDM (OFDM) symbol in described bandwidth F
rssithe ratio E obtaining
rsrq.
3. method according to claim 1, is characterized in that, described downlink reference signal is through pre-encode operation, and the precoding vector that a wherein said N port is corresponding is respectively v
1v
2l v
n.
4. method according to claim 1, is characterized in that, also comprises the steps:
-feeding back uplink interception reference signal (SRS).
5. method according to claim 1, is characterized in that, also comprises the steps:
-in described bandwidth F, select pre-coding matrix for a described N port to indicate (PMI)
-feed back described PMI.
6. method according to claim 1, is characterized in that, the described downlink reference signal of each port is reused the pattern of channel status instruction reference signal (CSI-RS).
7. method according to claim 1, is characterized in that, the downlink reference signal of a described S port is mapped in K subframe, and described K is positive integer, and described K is by signal deployment.
8. method according to claim 1, is characterized in that, the observation window of described downlink reference signal passes through signal deployment.
9. the method communicating in the system equipment of multi-input multi-output system, wherein, comprises the steps:
The downlink reference signal an of-precoding S port
-send described downlink reference signal
-receive N the port obtaining in a described S port for the beam selection vector (BSV) of bandwidth F to indicate
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.
10. method according to claim 9, it is characterized in that, each port in a described N port has higher link-quality than the S-N not a being instructed to port in described bandwidth F, and described link-quality obtains by detecting one of at least following parameter:
Mean receiving power E in the resource particle (RE) of-described downlink reference signal in described bandwidth F
rsrp
-described E
rsrpmean receiving power E in resource particle (RE) divided by described downlink reference signal place OFDM (OFDM) symbol in described bandwidth F
rssithe ratio E obtaining
rsrq.
11. methods according to claim 9, is characterized in that, described downlink reference signal is through pre-encode operation, and the precoding vector that a wherein said N port is corresponding is respectively v
1v
2l v
n.
12. methods according to claim 9, is characterized in that, also comprise the steps:
-uplink sounding reference signal (SRS) that physical antenna is received is according to described v
1v
2l v
nexecution reception precoding obtains N and organizes equivalent SRS
-carry out channel estimating according to described equivalent SRS to obtain N group equivalent channel parameter.
13. methods according to claim 9, is characterized in that, also comprise the steps:
-receive the pre-coding matrix in described bandwidth F for a described N port to indicate (PMI)
-calculate equivalent channels information according to described BSV and described PMI.
14. methods according to claim 9, is characterized in that, the described downlink reference signal of each port is reused the pattern of channel status instruction reference signal (CSI-RS).
15. 1 kinds of subscriber equipmenies, is characterized in that, this equipment comprises:
The first module: the downlink reference signal that receives S port;
The second module: select N port in a described S port for bandwidth F;
The 3rd module: feedback beam selection vector (BSV) pointer is to the N of a bandwidth F port.
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.
16. equipment according to claim 15, is characterized in that, this equipment also comprises:
Four module: feeding back uplink interception reference signal (SRS).
17. equipment according to claim 15, is characterized in that, this equipment also comprises:
The 5th module: for a described N port is selected pre-coding matrix instruction (PMI) in described bandwidth F;
The 6th module: feed back described PMI.
18. 1 kinds of network equipments, is characterized in that, this equipment comprises:
The first module: the downlink reference signal of a precoding S port
The second module: send described downlink reference signal
The 3rd module: receive for the beam selection vector (BSV) of bandwidth F and obtain N port instruction in a described S port.
Wherein:
Described S is greater than 1 positive integer, and described N is the positive integer that is less than or equal to described S, and described bandwidth F is the part in system bandwidth or system bandwidth.
19. equipment according to claim 18, is characterized in that, this equipment also comprises:
Four module: the uplink sounding reference signal (SRS) that physical antenna is received is according to described v
1v
2l v
nexecution reception precoding obtains N and organizes equivalent SRS.
The 5th module: carry out channel estimating according to described equivalent SRS and obtain N group equivalent channel parameter.
20. equipment according to claim 18, is characterized in that, this equipment also comprises:
The 6th module: receive the instruction of the pre-coding matrix in described bandwidth F (PMI) for a described N port
The 7th module: calculate equivalent channels information according to described BSV and described PMI.
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