CN102055567A - MIMO (Multiple Input Multiple Output) mode switching method and terminal equipment - Google Patents
MIMO (Multiple Input Multiple Output) mode switching method and terminal equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
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Abstract
The embodiment of the invention provides a MIMO (Multiple Input Multiple Output) mode switching method and corresponding terminal equipment. In the embodiment of the invention, UE can acquire an optimal precoding matrix and then obtain a first invariant probability according to the acquired optimal precoding matrix; the UE determines whether to enter a closed-loop MIMO mode through comparing the first invariant probability and a first threshold value; if so, the UE sends a first reporting message to a base station; therefore, the UE can enter the closed-loop MIMO mode under a proper channel condition, and the UE can feed back the first reporting message, which needs to consume few air interface frequency spectrum resources, to the base station only when the UE can enter the closed-loop MIMO mode, thereby the air interface frequency resources are saved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of MIMO mode changing method and terminal equipment.
Background technology
In order to obtain higher spectrum efficiency and power system capacity, with based on Long Term Evolution (LTE, Long Term Evolution) Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplex) system is the super 3 g mobile communication (B3G of system of representative, Beyond Third Generation in mobile communication system) and the 4th (4G of third-generation mobile communication system, Forth Generation in mobile communication system) cell mobile communication systems generally adopts multiple-input and multiple-output (MIMO, Multi-Input Multi-Output) technology, the MIMO technology can be divided into two kinds of patterns, be respectively open loop MIMO pattern and closed-loop MIMO pattern, terminal equipment (UE, when User Equipment) being in the closed-loop MIMO pattern, can continue to report pre-coding matrix indication (PMI to the base station, Precoding Matrix Indicator), making the base station can choose weighting matrix according to the PMI that UE reports is weighted each antenna emission data, when UE is in the open loop MIMO pattern, can not report PMI to the base station, not weighted value of data is launched to each antenna in the base station, perhaps add weights at random, though the closed-loop MIMO pattern is compared with the open loop MIMO pattern, can obtain higher spectrum efficiency, but because channel condition changes in the system, system can not realize adopting the closed-loop MIMO pattern always, but can only switch open loop MIMO pattern and closed-loop MIMO pattern according to the channel condition self adaptation.
In the prior art, the cell mobile communication systems of B3G/4G realizes switching according to the channel condition self adaptation flow process of open loop MIMO pattern and closed-loop MIMO pattern, and is specific as follows:
After UE networks, the base station judges according to prerequisite (such as channel quality) whether UE has the possibility that enters the closed-loop MIMO pattern, if have, then require UE to base station feedback PMI, handle the PMI of UE feedback the base station, judge according to result whether UE can enter the closed-loop MIMO pattern, if not, base station indication UE stops to feed back PMI, if base station indication UE enters the closed-loop MIMO pattern, the base station continues the PMI of UE feedback is handled, until drawing the judged result that UE can not enter the closed-loop MIMO pattern, base station indication UE withdraws from the closed-loop MIMO pattern.
Though UE can be prejudged in the base station whether the possibility that enters the closed-loop MIMO pattern is arranged, just require UE to base station feedback PMI then, but the base station still might be that UE can't enter the closed-loop MIMO pattern to the result of PMI, and UE has just wasted the frequency spectrum resource of eating dishes without rice or wine to the PMI of base station feedback like this.
Summary of the invention
The embodiment of the invention provides a kind of MIMO mode changing method and base station.
A kind of MIMO mode changing method comprises: obtain the first optimum pre-coding matrix; Obtain first changeable probability not according to the first optimum pre-coding matrix; Judge first not changeable probability whether greater than first threshold value; If, then sending first reporting message to the base station, the request of carrying of first reporting message enters the information of closed loop multiple-input and multiple-output MIMO pattern; The indication that receives the base station transmission enters the information of closed-loop MIMO pattern.
A kind of MIMO mode changing method comprises: after entering closed loop multiple-input and multiple-output MIMO pattern, obtain the second optimum pre-coding matrix; Obtain second changeable probability not according to the second optimum pre-coding matrix; Judge second not changeable probability whether less than second threshold value, if, then send second reporting message to the base station, the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message; The information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission.
A kind of terminal equipment comprises: first acquiring unit, be used to obtain the first optimum pre-coding matrix, and obtain first changeable probability not according to the first optimum pre-coding matrix; First judging unit, be used to judge described first acquiring unit obtains first not changeable probability whether greater than first threshold value; Described first Transmit-Receive Unit, be used for first when changeable probability is not greater than first threshold value, send first reporting message to the base station, the request of carrying of first reporting message enters the information of closed-loop MIMO pattern, and the indication of reception base station transmission enters the information of closed-loop MIMO pattern.
A kind of terminal equipment comprises: second acquisition unit, be used for after terminal equipment enters the closed-loop MIMO pattern, and obtain the second optimum pre-coding matrix; Obtain second changeable probability not according to the second optimum pre-coding matrix; Second judging unit, be used to judge second not changeable probability whether less than second threshold value; Described second Transmit-Receive Unit, be used for second when changeable probability is not less than second threshold value, send second reporting message to the base station, the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message, and the information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission.
In the embodiment of the invention, UE can obtain the first optimum pre-coding matrix, obtain first changeable probability not according to the first optimum pre-coding matrix that is obtained then, UE is by judging first magnitude relationship of changeable probability and first threshold value not, determine whether to enter the closed-loop MIMO pattern, if, then send first reporting message to the base station, therefore UE can enter the closed-loop MIMO pattern when channel condition is fit to, and UE is only in the time entering the closed-loop MIMO pattern,, saved the frequency spectrum resource of eating dishes without rice or wine to seldom eat dishes without rice or wine first reporting message of frequency spectrum resource of base station feedback consumption.
Description of drawings
Fig. 1 is the schematic flow sheet of the MIMO mode changing method that embodiment provides in the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the MIMO mode changing method that another embodiment provides in the embodiment of the invention;
Fig. 3 is the logical construction schematic diagram of the terminal equipment that embodiment provides in the embodiment of the invention;
Fig. 4 is the logical construction schematic diagram of the terminal equipment that another embodiment provides in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of MIMO mode changing method, and the embodiment of the invention also provides corresponding terminal device, below is elaborated respectively.
See also Fig. 1, one embodiment of the present of invention provide the MIMO mode changing method, and UE can determine whether that from the open loop MIMO mode switch to the closed-loop MIMO pattern, idiographic flow comprises:
101, obtain the first optimum pre-coding matrix;
In mimo system, configuration for each transmitting antenna, can set up a pre-coding matrix (PM, Precoding Matrix) set, and all known this set of base station and UE, set of matrices is called the MIMO code book, in case determine the code book that mimo system uses, UE will observe the situation of channel, selects optimum pre-coding matrix.
The method that UE obtains optimum pre-coding matrix comprises following two kinds:
1, UE is according to certain rule, use each pre-coding matrix and the actual channel of eating dishes without rice or wine in the code book to do coupling, (CSI, Channel State Information) chooses the best pre-coding matrix of matching effect, promptly optimum pre-coding matrix according to channel condition information.The matching effect that UE can judge pre-coding matrix and the actual channel of eating dishes without rice or wine according to the error probability or the throughput of system, when the error probability minimum of system or throughput are maximum, then think this moment the pre-coding matrix that mates and the matching effect of the actual channel of eating dishes without rice or wine best, this pre-coding matrix is exactly optimum pre-coding matrix.
2, UE also can adopt direct calculating to obtain optimum pre-coding matrix, for example UE can use covariance matrix or channel matrix to be singular value decomposition (SVD earlier, Singular Value Decomposition) or characteristic value decomposition, obtain a pre-coding matrix.If in the code book this pre-coding matrix is arranged, this pre-coding matrix is exactly optimum pre-coding matrix so, if do not have this pre-coding matrix in the code book, UE seeks in code book and the most similar pre-coding matrix of pre-coding matrix that calculates gained so, and the pre-coding matrix that will search out from code book is as optimum pre-coding matrix.
In embodiments of the present invention, UE can adopt said method to obtain the first optimum pre-coding matrix.Need to prove that the first optimum pre-coding matrix is not represented optimum pre-coding matrix is carried out qualification on the order.
102, obtain first changeable probability not according to the first optimum pre-coding matrix;
After UE gets access to the first optimum pre-coding matrix, obtain first changeable probability not according to the first optimum pre-coding matrix.In this article, whether identical constant probability represent between current optimum pre-coding matrix and the last optimum pre-coding matrix probability.First not the initial value of changeable probability can value be 0.
Need to prove, first not changeable probability do not represent changeable probability is not carried out qualification on the order.
103, whether changeable probability is greater than first threshold value to judge first, and if not, then execution in step 104, if then execution in step 105;
In this step, UE can preset first threshold value, also can carry out testing evaluation under channel condition, thereby obtain first threshold value.It will be appreciated by those skilled in the art that the first threshold value value that obtains according to different scenes and/or different channel condition UE may be different.For example, according to the not definition of changeable probability, the first threshold value value is the arbitrary value among the 1/N to 1, and wherein N is the pre-coding matrix quantity in the code book, by adjusting the first threshold value value from big to small, can increase the probability that UE can enter the closed-loop MIMO pattern.
Need to prove that first threshold value is not represented threshold value is carried out qualification on the order.
Need to prove that when UE had just networked, because open loop does not need to use the characteristic of channel of eating dishes without rice or wine between base station and the UE, what UE at first adopted was the open loop MIMO pattern.
If first not changeable probability be not more than first threshold value, then UE can be known: can't realize the closed-loop MIMO pattern according to current channel condition, then the UE execution in step 104, keep current open loop MIMO pattern.
If first changeable probability is not greater than first threshold value, then UE can be known: can realize the closed-loop MIMO pattern according to current channel condition, and UE execution in step 105, UE enters the closed-loop MIMO pattern, thereby obtains higher spectrum efficiency.
104, keep current open loop MIMO pattern, return step 101;
When the judged result of step 103 be first not changeable probability be not more than first threshold value, UE keeps current open loop MIMO pattern, and UE execution in step 101 once more.
105, send first reporting message to the base station, the request of carrying of first reporting message enters the information of closed-loop MIMO pattern;
When the judged result of step 103 is that first changeable probability is not greater than first threshold value, UE sends first reporting message to the base station, and the request of carrying of first reporting message enters the information of closed-loop MIMO pattern.
UE is after the base station sends first reporting information, the indication that UE reception base station issues allows UE enter the information of closed-loop MIMO pattern, UE from the open loop MIMO mode switch to the closed-loop MIMO pattern, UE can continue feedback PMI to the base station under the closed-loop MIMO pattern, make the base station can choose weighting and put to the proof each antenna emission data is weighted according to the PMI of UE feedback, allow the base station with the more multiple energy centralization of penetrating to UE.
The method that present embodiment provides can be carried out by UE, UE can obtain the first optimum pre-coding matrix, obtain first changeable probability not according to the first optimum pre-coding matrix that is obtained then, UE is by judging first magnitude relationship of changeable probability and first threshold value not, determine whether to enter the closed-loop MIMO pattern, if, then send first reporting message to the base station, therefore UE can enter the closed-loop MIMO pattern when channel condition is fit to, and UE is only in the time entering the closed-loop MIMO pattern,, saved the frequency spectrum resource of eating dishes without rice or wine to seldom eat dishes without rice or wine first reporting message of frequency spectrum resource of base station feedback consumption.
No matter it will be appreciated by those skilled in the art that, be the FDD system, or time division duplex (TDD, Time Division Duplexing) system, and UE can carry out the foregoing description, thereby realize switching the ring MIMO pattern that opens and closes.Therefore, the foregoing description both had been applicable to the FDD system, was applicable to the TDD system again.
See also Fig. 2, an alternative embodiment of the invention provides the MIMO mode changing method.In the present embodiment, after UE entered the closed-loop MIMO pattern, system can determine further whether UE will return the open loop MIMO pattern from the closed-loop MIMO mode switch.Present embodiment can comprise the steps:
201, obtain the second optimum pre-coding matrix;
After UE entered the closed-loop MIMO pattern, UE obtained the second optimum pre-coding matrix.Need to prove that the second optimum pre-coding matrix is not represented optimum pre-coding matrix is carried out qualification on the order.The method that UE obtains the second optimum pre-coding matrix and UE obtain the method for the first optimum pre-coding matrix can be identical, just repeats no more.
202, obtain second changeable probability not according to the second optimum pre-coding matrix;
UE obtains second changeable probability not according to the second optimum pre-coding matrix.
Need to prove, second not changeable probability do not represent changeable probability is not carried out qualification on the order.
203, whether changeable probability is less than second threshold value to judge second, and if not, then execution in step 204, if then execution in step 205.
In this step, UE can preset second threshold value, second threshold value can be set to be not more than first threshold value, also can under channel condition, carry out testing evaluation, thereby obtain second threshold value, it will be appreciated by those skilled in the art that the second threshold value value that obtains according to different scenes and/or different channel condition UE may be different.For example, according to the not definition of changeable probability, the second threshold value value is the arbitrary value among the 1/N to 1, wherein N is the pre-coding matrix quantity in the code book, by adjusting the second threshold value value, can prevent frequent switching ring MIMO mode switch, thereby reduce processing expenditure.
If second not changeable probability be not less than second threshold value, then UE can be known: still can realize the closed-loop MIMO pattern according to current channel condition UE, then the UE execution in step 204, keep current closed-loop MIMO pattern.
If second changeable probability is not less than second threshold value, then UE can be known: can't realize the closed-loop MIMO pattern according to current channel condition, and UE execution in step 205, UE enters the open loop MIMO pattern.
204, keep current closed-loop MIMO pattern, and execution in step 201 once more;
When the judged result of step 208 be second not changeable probability be not less than first threshold value, UE keeps current closed-loop MIMO pattern, UE is execution in step 201 once more.
205, send second reporting message to the base station, the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message.
When the judged result of step 203 is that second changeable probability is not less than second threshold value, UE sends second reporting message to the base station, and the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message.
UE is after the base station sends second reporting information, and UE receives indication that the base station issues allows UE withdraw from the information of closed-loop MIMO pattern, UE from the closed-loop MIMO mode switch to the open loop MIMO pattern.
The method that present embodiment provides can be carried out by UE.In the present embodiment, after UE enters the closed-loop MIMO pattern, UE continues to obtain the second optimum pre-coding matrix, when by judging second magnitude relationship of changeable probability and second threshold value not, UE can determine whether and will return the open loop MIMO pattern from the closed-loop MIMO mode switch, compared with prior art, determine whether from the closed-loop MIMO mode switch can to save the electric weight of base station and the resource of base station by UE to the open loop MIMO pattern.
No matter it will be appreciated by those skilled in the art that, be the FDD system, or the TDD system, and UE can carry out embodiment as shown in Figure 2, thereby realize switching the ring MIMO pattern that opens and closes.Therefore, embodiment as shown in Figure 2 both had been applicable to the FDD system, was applicable to the TDD system again.
An alternative embodiment of the invention provides the MIMO mode changing method, and present embodiment has been described UE and entered the closed-loop MIMO pattern from the open loop MIMO pattern, and the process that enters the open loop MIMO pattern from the closed-loop MIMO pattern.In the present embodiment, UE obtains the first optimum pre-coding matrix, obtain first changeable probability not by carrying out the Alpha filtering according to the first optimum pre-coding matrix, enter the closed-loop MIMO pattern from the open loop MIMO pattern then, obtain the second optimum pre-coding matrix again, obtain second changeable probability not by carrying out the Alpha filtering according to the second optimum pre-coding matrix equally, enter the open loop MIMO pattern from the closed-loop MIMO pattern then, UE not only can enter the closed-loop MIMO pattern according to channel condition, and UE enters in the process of closed-loop MIMO pattern in execution, can save the frequency spectrum resource of eating dishes without rice or wine, and the switching that opens and closes ring MIMO pattern all is to be controlled by UE, has also further saved the electric weight of base station and the resource of base station.
In the present embodiment, N is placed in the bracket and the i.e. form of X (N), N the parameter X that expression is obtained as the some of parameter X.For example, in the present embodiment, represent optimum pre-coding matrix with PM_best, then, with N the optimum pre-coding matrix that PM_best (N) expression UE obtains, N 〉=1.
In the present embodiment, represent not changeable probability with P_Con, as previously mentioned, whether identical P_Con refer between current PM_best and the last PM_best probability, in the present embodiment, UE handles optimum pre-coding matrix and obtains not that changeable probability can be an Alpha filtering, specifically comprises:
Current constant probability P _ Con (N+1) value is: 1 and the product of the absolute difference of filter factor Alpha and last one first constant probability P _ Con (N) again with the value of current probability coefficent P_Cur (N+1) with the product addition gained of filter factor Alpha, available formula is described: P_Con (N+1)=(1-Alpha) * P_Con (N)+Alpha*P_Cur (N+1), the initial value P_Con (1)=0 of changeable probability not wherein, UE compares with PM_best (N+1) and PM_best (N), if equate, then probability coefficent P_Cur (N+1) value is 1, otherwise P_Cur (N+1) value is 0, for guarantee P_Con be one greater than zero probability, Alpha is for greater than 0 and be less than or equal to arbitrary number of 1.
Need to prove that UE can preset filter factor Alpha, also can under channel condition, carry out testing evaluation, thereby obtain Alpha.It will be appreciated by those skilled in the art that the Alpha value that obtains according to different scenes and/or different channel condition UE may be different.By adjusting the Alpha value, both can avoid to avoid opening and closing the time-delay of ring MIMO pattern again and switching or do not switch because changeable probability instability not causes frequent switching ring MIMO mode switch, thereby causes processing expenditure bigger.
Also need to prove, though in the foregoing description, UE be according to changeable probability not with corresponding to the relation of the threshold value of changeable probability not, carry out the switching of closed-loop MIMO pattern and open loop MIMO pattern, UE can also be according to closed loop gain and relation corresponding to the threshold value of closed loop gain, carry out the switching of closed-loop MIMO pattern and open loop MIMO pattern, to those skilled in the art, according to religious doctrine of the present invention, obviously can make amendment to the foregoing description according to closed loop gain according to actual needs, realize the switching of closed-loop MIMO pattern and open loop MIMO pattern, for example, after UE gets access to first closed loop gain, to be the arbitrary value in 1 to M corresponding to the first threshold value value of first closed loop gain, wherein M is the arbitrary number greater than 2, by adjusting M according to the code word number of emission and antenna number that receives and transmission, thereby adjust the first threshold value value, can increase the probability that UE can enter the closed-loop MIMO pattern, when first closed loop gain is not more than first threshold value, UE keeps current open loop MIMO pattern, when first closed loop gain greater than first threshold value, UE enters the closed-loop MIMO pattern, after UE gets access to second closed loop gain, with the corresponding second threshold value value with second closed loop gain is arbitrary value in 1 to N, wherein N is the arbitrary number greater than 2, and second threshold value is not more than first threshold value, UE is by adjusting M according to the code word number of emission and antenna number that receives and transmission, thereby adjust the second threshold value value, can prevent frequent switching ring MIMO mode switch, thereby reduction processing expenditure, when second closed loop gain is not less than second threshold value, UE keeps current closed-loop MIMO pattern, when second closed loop gain less than corresponding to second threshold value, UE enters the open loop MIMO pattern.
See also Fig. 3, an alternative embodiment of the invention provides a kind of terminal equipment 30.This terminal equipment 30 can comprise first acquiring unit 301, first judging unit 302, first Transmit-Receive Unit 303.Wherein,
First acquiring unit 301 is used to obtain the first optimum pre-coding matrix, obtains first changeable probability not according to the first optimum pre-coding matrix;
First judging unit 302, be used to judge first acquiring unit 301 obtains first not changeable probability whether greater than first threshold value;
First Transmit-Receive Unit 303, be used for first when changeable probability is not greater than first threshold value, send first reporting message to the base station, the request of carrying of first reporting message enters the information of closed-loop MIMO pattern, and the indication of reception base station transmission enters the information of closed-loop MIMO pattern.
When first acquiring unit 301 obtains first not during changeable probability according to the first optimum pre-coding matrix, optionally, first acquiring unit 301, specifically be used for first not the initial value value of changeable probability be 0; Optionally, first acquiring unit 301 specifically is used for if the current first optimum pre-coding matrix equals an optimum pre-coding matrix, and then current probability coefficent value is 1; Perhaps, if the current first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, then current probability coefficent value is 0.
When first acquiring unit 301 obtains the first optimum pre-coding matrix, optionally, first acquiring unit 302, specifically be used for using each pre-coding matrix of code book and the actual channel of eating dishes without rice or wine to do coupling, choose the best pre-coding matrix of matching effect as the first optimum pre-coding matrix according to the channel capacity maximization according to channel condition information.
Terminal equipment 30 in the present embodiment can be used in as shown in Figure 1 the method that embodiment provided, promptly carry out each action that realizes by terminal equipment in this method, the parameter that terminal equipment adopted in the present embodiment also can repeat no more with reference to the explanation in this method herein.And the terminal equipment 30 in the present embodiment both had been applicable to the FDD system, was applicable to the TDD system again.
In the present embodiment, first acquiring unit 301 can obtain the first optimum pre-coding matrix, obtain first changeable probability not according to the first optimum pre-coding matrix that is obtained then, first judging unit 302 is by judging first magnitude relationship of changeable probability and first threshold value not, determine whether to enter the closed-loop MIMO pattern, if, then first Transmit-Receive Unit 303 sends first reporting message to the base station, therefore terminal equipment 30 can enter the closed-loop MIMO pattern when channel condition is fit to, and 30 on terminal equipment is in the time entering the closed-loop MIMO pattern, just need consume first reporting message of the frequency spectrum resource of seldom eating dishes without rice or wine, save the frequency spectrum resource of eating dishes without rice or wine to base station feedback.
See also Fig. 4, an alternative embodiment of the invention provides a kind of terminal equipment 40.This terminal equipment 40 comprises second acquisition unit 401, second judging unit 402 and second Transmit-Receive Unit 403.Wherein,
Second acquisition unit 401 is used to obtain the second optimum pre-coding matrix; Obtain second changeable probability not according to the second optimum pre-coding matrix;
Optionally, second acquisition unit 401 specifically is used to use covariance matrix to do singular value decomposition, obtains the second optimum pre-coding matrix.
Second judging unit 402, be used to judge second not changeable probability whether less than second threshold value;
Second Transmit-Receive Unit 403 is used for sending second reporting message second when changeable probability is not less than second threshold value to the base station, and the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message, receives the information that the closed-loop MIMO pattern is withdrawed from indication that the base station sends;
Optionally, the terminal equipment 40 in the present embodiment also comprises switch unit 404, is used for entering the closed-loop MIMO pattern after the indication that receives the base station transmission enters the information of closed-loop MIMO pattern; And/or, after the information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission, withdraw from the closed-loop MIMO pattern.
Terminal equipment 40 in the present embodiment can be used in as shown in Figure 2 the method that embodiment provided, promptly carry out each action that realizes by terminal equipment in this method, the parameter that terminal equipment adopted in the present embodiment also can repeat no more with reference to the explanation in this method herein.And the terminal equipment 40 in the present embodiment both had been applicable to the FDD system, was applicable to the TDD system again.
In the present embodiment, after terminal equipment 40 enters the closed-loop MIMO pattern, second acquisition unit 401 obtains the second optimum pre-coding matrix, second judging unit 402 is by judging second magnitude relationship of changeable probability and second threshold value not, can determine whether and to return the open loop MIMO pattern from the closed-loop MIMO mode switch, compared with prior art, determine whether and to return the open loop MIMO pattern from the closed-loop MIMO mode switch, can save the electric weight of base station and the resource of base station by terminal equipment 40.
Further, the embodiment of the invention also provides a kind of terminal equipment, comprise first acquiring unit 301, first judging unit 302, first Transmit-Receive Unit 303, and second acquisition unit 401, second judging unit 402 and second Transmit-Receive Unit 403, the function of each unit is identical with the function essence of corresponding unit in the foregoing description.In addition, this terminal equipment can also comprise switch unit 404, and its function is identical with the function essence of corresponding unit (being switch unit) in the foregoing description.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than MIMO mode changing method and terminal equipment that the embodiment of the invention provided are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (15)
1. a multiple-input and multiple-output MIMO mode switching method is characterized in that, comprising:
Obtain the first optimum pre-coding matrix;
Obtain first changeable probability not according to the first optimum pre-coding matrix;
Judge first not changeable probability whether greater than first threshold value;
If, then sending first reporting message to the base station, the request of carrying of first reporting message enters the information of closed loop multiple-input and multiple-output MIMO pattern;
The indication that receives the base station transmission enters the information of closed-loop MIMO pattern.
2. method according to claim 1 is characterized in that,
Obtain first changeable probability not according to the first optimum pre-coding matrix, comprising:
First not the initial value value of changeable probability be 0.
3. method according to claim 1 and 2 is characterized in that, obtains first changeable probability not according to the first optimum pre-coding matrix, comprising:
If the current first optimum pre-coding matrix equals an optimum pre-coding matrix, then current probability coefficent value is 1; Perhaps
If the current first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, then current probability coefficent value is 0.
4. method according to claim 3 is characterized in that,
Obtain the first optimum pre-coding matrix, specifically comprise:
Use each pre-coding matrix and the actual channel of eating dishes without rice or wine in the code book to do coupling, choose the best pre-coding matrix of matching effect as the first optimum pre-coding matrix according to channel condition information.
5. method according to claim 4 is characterized in that, receives after the step of information that indication that the base station sends enters the closed-loop MIMO pattern, also comprises:
Enter the closed-loop MIMO pattern.
6. a MIMO mode changing method is characterized in that, comprising:
After entering closed loop multiple-input and multiple-output MIMO pattern, obtain the second optimum pre-coding matrix;
Obtain second changeable probability not according to the second optimum pre-coding matrix;
Judge second not changeable probability whether less than second threshold value, if, then send second reporting message to the base station, the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message;
The information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission.
7. method according to claim 6 is characterized in that,
Obtain the second optimum pre-coding matrix, specifically comprise:
Use covariance matrix to do singular value decomposition, obtain the second optimum pre-coding matrix.
8. according to claim 6 or 7 described methods, it is characterized in that, receive indication that the base station sends and withdraw from after the step of information of closed-loop MIMO pattern, also comprise:
Withdraw from the closed-loop MIMO pattern.
9. a terminal equipment is characterized in that, comprising:
First acquiring unit is used to obtain the first optimum pre-coding matrix, obtains first changeable probability not according to the first optimum pre-coding matrix;
First judging unit, be used to judge described first acquiring unit obtains first not changeable probability whether greater than first threshold value;
Described first Transmit-Receive Unit, be used for first when changeable probability is not greater than first threshold value, send first reporting message to the base station, the request of carrying of first reporting message enters the information of closed-loop MIMO pattern, and the indication of reception base station transmission enters the information of closed-loop MIMO pattern.
10. terminal equipment according to claim 9 is characterized in that,
Described first acquiring unit, specifically be used for first not the initial value value of changeable probability be 0.
11. according to claim 9 or 10 described terminal equipments, it is characterized in that,
Described first acquiring unit specifically is used for if the current first optimum pre-coding matrix equals an optimum pre-coding matrix, and then current probability coefficent value is 1; Perhaps, if the current first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, then current probability coefficent value is 0.
12. terminal equipment according to claim 11 is characterized in that,
Described first acquiring unit specifically is used for using each pre-coding matrix of code book and the actual channel of eating dishes without rice or wine to do coupling, chooses the best pre-coding matrix of matching effect as the first optimum pre-coding matrix according to channel condition information.
13. a terminal equipment is characterized in that, comprising:
Second acquisition unit is used for after terminal equipment enters the closed-loop MIMO pattern, obtains the second optimum pre-coding matrix; Obtain second changeable probability not according to the second optimum pre-coding matrix;
Second judging unit, be used to judge second not changeable probability whether less than second threshold value;
Described second Transmit-Receive Unit, be used for second when changeable probability is not less than second threshold value, send second reporting message to the base station, the information of closed-loop MIMO pattern is withdrawed from the request of carrying of second reporting message, and the information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission.
14. terminal equipment according to claim 13 is characterized in that,
Described second acquisition unit specifically is used to use covariance matrix to do singular value decomposition, obtains the second optimum pre-coding matrix.
15. according to claim 13 or 14 described terminal equipments, it is characterized in that, also comprise:
Switch unit is used for entering the closed-loop MIMO pattern after the indication that receives the base station transmission enters the information of closed-loop MIMO pattern; And/or
After the information of closed-loop MIMO pattern is withdrawed from the indication that receives the base station transmission, withdraw from the closed-loop MIMO pattern.
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| WO2012100745A1 (en) | 2012-08-02 |
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