CN102055567B - 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) the super 3 g mobile communication system (B3G that system is representative, Beyond Third Generation in mobile communication system) and the 4th Generation Mobile Communication System (4G, Forth Generation in mobile communication system) cell mobile communication systems generally adopts multiple-input and multiple-output (MIMO, Multi-Input Multi-Output) technology, MIMO technology can be divided into two kinds of patterns, be respectively open loop MIMO pattern and closed-loop MIMO pattern, terminal equipment (UE, User Equipment) when closed-loop MIMO pattern, can continue to report to base station pre-coding matrix indication (PMI, Precoding Matrix Indicator), the PMI that base station can be reported according to UE chooses weighting matrix each antenna transmission data is weighted, UE is when open loop MIMO pattern, can not report PMI to base station, base station is to each antenna transmission data weighted value not, or add random weights, although closed-loop MIMO pattern is compared with open loop MIMO pattern, can obtain higher spectrum efficiency, but because channel condition in system changes, system can not realize and adopt closed-loop MIMO pattern always, but can only switch open loop MIMO pattern and closed-loop MIMO pattern according to channel condition self adaptation.
In prior art, the cell mobile communication systems of B3G/4G is realized the flow process of switching open loop MIMO pattern and closed-loop MIMO pattern according to channel condition self adaptation, specific as follows:
After UE networks, base station judges according to prerequisite (such as channel quality) whether UE has the possibility that enters closed-loop MIMO pattern, if have, require UE to base station feedback PMI, process the PMI of UE feedback base station, according to result, judge whether UE can enter closed-loop MIMO pattern, if not, base station indication UE stops feeding back PMI, if so, indication UE in base station enters closed-loop MIMO pattern, and base station continues the PMI of UE feedback to process, until show that UE can not enter the judged result of closed-loop MIMO pattern, base station indication UE exits closed-loop MIMO pattern.
Although can prejudging UE, base station whether has the possibility that enters closed-loop MIMO pattern, then just require UE to base station feedback PMI, but base station is likely still that UE cannot enter closed-loop MIMO pattern to the result of PMI, and UE has just wasted to the PMI of base station feedback the frequency spectrum resource of eating dishes without rice or wine like this.
Summary of the invention
The embodiment of the present invention provides a kind of MIMO mode changing method and base station.
A MIMO mode changing method, comprising: obtain the first optimum pre-coding matrix; According to the first optimum pre-coding matrix, obtain the first invariant probability; Judge whether the first invariant probability is greater than the first threshold value; If so, to base station, send the first reporting message, the request of carrying of the first reporting message enters the information of closed loop multiple-input and multiple-output MIMO pattern; The indication that receives base station transmission enters the information of closed-loop MIMO pattern.
A MIMO mode changing method, comprising: enter after closed loop multiple-input and multiple-output MIMO pattern, obtain the second optimum pre-coding matrix; According to the second optimum pre-coding matrix, obtain the second invariant probability; Judge whether the second invariant probability is less than the second threshold value, if so, to base station, send the second reporting message, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message; The information of closed-loop MIMO pattern is exited in the indication that receives base station transmission.
A terminal equipment, comprising: the first acquiring unit, for obtaining the first optimum pre-coding matrix, obtains the first invariant probability according to the first optimum pre-coding matrix; The first judging unit, for judging whether the first invariant probability that described the first acquiring unit obtains is greater than the first threshold value; Described the first Transmit-Receive Unit, for when the first invariant probability is greater than the first threshold value, to base station, send the first reporting message, the request of carrying of the 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 terminal equipment, comprising: second acquisition unit, for entering after closed-loop MIMO pattern at terminal equipment, obtains the second optimum pre-coding matrix; According to the second optimum pre-coding matrix, obtain the second invariant probability; The second judging unit, for judging whether the second invariant probability is less than the second threshold value; Described the second Transmit-Receive Unit, for when the second invariant probability is less than the second threshold value, to base station, send the second reporting message, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message, and the information of closed-loop MIMO pattern is exited in the indication that receives base station transmission.
In the embodiment of the present invention, UE can obtain the first optimum pre-coding matrix, then according to the first obtained optimum pre-coding matrix, obtain the first invariant probability, UE is by the magnitude relationship of judgement the first invariant probability and the first threshold value, determine whether to enter closed-loop MIMO pattern, if, to base station, send the first reporting message, therefore UE can enter closed-loop MIMO pattern when channel condition is applicable, and UE is only in the time entering closed-loop MIMO pattern, just to seldom eat dishes without rice or wine the first reporting message of frequency spectrum resource of base station feedback consumption, saved the frequency spectrum resource of eating dishes without rice or wine.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the MIMO mode changing method that in the embodiment of the present invention, embodiment provides;
Fig. 2 is the schematic flow sheet of the MIMO mode changing method that in the embodiment of the present invention, another embodiment provides;
Fig. 3 is the logical construction schematic diagram of the terminal equipment that in the embodiment of the present invention, embodiment provides;
Fig. 4 is the logical construction schematic diagram of the terminal equipment that in the embodiment of the present invention, another embodiment provides.
Embodiment
The embodiment of the present invention provides a kind of MIMO mode changing method, and the embodiment of the present invention also provides corresponding terminal equipment, below is elaborated respectively.
Refer to Fig. 1, one embodiment of the present of invention provide MIMO mode changing method, and UE can determine whether to be switched to closed-loop MIMO pattern from open loop MIMO pattern, and 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 base station and UE be known this set, and set of matrices is called MIMO code book, once determine the code book that mimo system is used, 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, each pre-coding matrix in use code book and the actual channel of eating dishes without rice or wine are done and are mated, according to channel condition information (CSI, Channel State Information), choose the best pre-coding matrix of matching effect, i.e. optimum pre-coding matrix.UE can judge according to the error probability of system or throughput the matching effect of pre-coding matrix and the actual channel of eating dishes without rice or wine, when the error probability minimum of system or throughput are when maximum, think that the matching effect of the pre-coding matrix that now mates and the actual channel of eating dishes without rice or wine is 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 first be used covariance matrix or channel matrix to be singular value decomposition (SVD, Singular Value Decomposition) or Eigenvalues Decomposition, obtain a pre-coding matrix.If there is this pre-coding matrix in code book, this pre-coding matrix is exactly optimum pre-coding matrix so, if there is no this pre-coding matrix in code book, UE finds the pre-coding matrix the most similar to the pre-coding matrix that calculates gained in code book so, using the pre-coding matrix searching out from code book as optimum pre-coding matrix.
In embodiments of the present invention, UE can adopt said method to obtain the first optimum pre-coding matrix.It should be noted that, the first optimum pre-coding matrix does not represent optimum pre-coding matrix to carry out the restriction on order.
102, according to the first optimum pre-coding matrix, obtain the first invariant probability;
When UE gets after the first optimum pre-coding matrix, according to the first optimum pre-coding matrix, obtain the first invariant probability.In this article, whether identical invariant probability represent between current optimum pre-coding matrix and a upper optimum pre-coding matrix probability.The initial value of the first invariant probability can value be 0.
It should be noted that, the first invariant probability does not represent invariant probability to carry out the restriction on order.
103, judge whether the first invariant probability is greater than the first threshold value, if not, perform step 104, if so, perform step 105;
In this step, UE can preset the first threshold value, also can under channel condition, carry out testing evaluation, thereby obtains the first threshold value.It will be appreciated by those skilled in the art that, the first threshold value value obtaining according to different scenes and/or different channel condition UE may be different.For example, according to the definition of invariant probability, the first threshold value value is the arbitrary value in 1/N to 1, and wherein N is the pre-coding matrix quantity in code book, by adjusting from big to small the first threshold value value, can increase the probability that UE can enter closed-loop MIMO pattern.
It should be noted that, the first threshold value does not represent threshold value to carry out the restriction on order.
It should be noted that, when UE has 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 UE, what first UE adopted is open loop MIMO pattern.
If the first invariant probability is not more than the first threshold value, UE can be known: according to current channel condition, cannot realize closed-loop MIMO pattern, UE execution step 104, keep current open loop MIMO pattern.
If the first invariant probability is greater than the first threshold value, UE can be known: according to current channel condition, can realize closed-loop MIMO pattern, UE execution step 105, UE enters closed-loop MIMO pattern, thereby obtains higher spectrum efficiency.
104, keep current open loop MIMO pattern, return to step 101;
When first invariant probability that judgment result is that of step 103 is not more than the first threshold value, UE keeps current open loop MIMO pattern, and UE performs step 101 again.
105, to base station, send the first reporting message, the request of carrying of the first reporting message enters the information of closed-loop MIMO pattern;
When first invariant probability that judgment result is that of step 103 is greater than the first threshold value, UE sends the first reporting message to base station, and the request of carrying of the first reporting message enters the information of closed-loop MIMO pattern.
UE sends after the first reporting information to base station, the indication that UE reception base station issues allows UE enter the information of closed-loop MIMO pattern, UE is switched to closed-loop MIMO pattern from open loop MIMO pattern, UE can continue to base station feedback PMI under closed-loop MIMO pattern, make base station to choose weighting according to the PMI of UE feedback and put to the proof each antenna transmission data are weighted, allow base station more multi-emitting energy centralization to UE.
The method that the present embodiment provides can be carried out by UE, UE can obtain the first optimum pre-coding matrix, then according to the first obtained optimum pre-coding matrix, obtain the first invariant probability, UE is by the magnitude relationship of judgement the first invariant probability and the first threshold value, determine whether to enter closed-loop MIMO pattern, if, to base station, send the first reporting message, therefore UE can enter closed-loop MIMO pattern when channel condition is applicable, and UE is only in the time entering closed-loop MIMO pattern, just to seldom eat dishes without rice or wine the first reporting message of frequency spectrum resource of base station feedback consumption, saved the frequency spectrum resource of eating dishes without rice or wine.
No matter it will be appreciated by those skilled in the art that, be FDD system, or time division duplex (TDD, Time Division Duplexing) system, and UE can carry out above-described embodiment, thereby realize, switches Open-closed-loop MIMO pattern.Therefore, above-described embodiment had both been applicable to FDD system, was applicable to again TDD system.
Refer to Fig. 2, an alternative embodiment of the invention provides MIMO mode changing method.In the present embodiment, at UE, enter after closed-loop MIMO pattern, system can further determine whether UE will switch back open loop MIMO pattern from closed-loop MIMO pattern.The present embodiment can comprise the steps:
201, obtain the second optimum pre-coding matrix;
UE enters after closed-loop MIMO pattern, and UE obtains the second optimum pre-coding matrix.It should be noted that, the second optimum pre-coding matrix does not represent optimum pre-coding matrix to carry out the restriction on order.UE obtains the method for the second optimum pre-coding matrix and method that UE obtains the first optimum pre-coding matrix can be identical, just repeats no more.
202, according to the second optimum pre-coding matrix, obtain the second invariant probability;
UE obtains the second invariant probability according to the second optimum pre-coding matrix.
It should be noted that, the second invariant probability does not represent invariant probability to carry out the restriction on order.
203, judge whether the second invariant probability is less than the second threshold value, if not, perform step 204, if so, perform step 205.
In this step, UE can preset the second threshold value, the second threshold value can be set to be not more than the first threshold value, also can under channel condition, carry out testing evaluation, thereby obtain the second threshold value, it will be appreciated by those skilled in the art that, the second threshold value value obtaining according to different scenes and/or different channel condition UE may be different.For example, according to the definition of invariant probability, the second threshold value value is the arbitrary value in 1/N to 1, wherein N is the pre-coding matrix quantity in code book, by adjusting the second threshold value value, can prevent that Open-closed-loop MIMO pattern is switched frequently, thereby reduce processing expenditure.
If the second invariant probability is not less than the second threshold value, UE can be known: according to current channel condition UE, still can realize closed-loop MIMO pattern, UE execution step 204, keep current closed-loop MIMO pattern.
If the second invariant probability is less than the second threshold value, UE can be known: according to current channel condition, cannot realize closed-loop MIMO pattern, UE execution step 205, UE enters open loop MIMO pattern.
204, keep current closed-loop MIMO pattern, and again perform step 201;
When second invariant probability that judgment result is that of step 208 is not less than the first threshold value, UE keeps current closed-loop MIMO pattern, and UE performs step 201 again.
205, to base station, send the second reporting message, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message.
When second invariant probability that judgment result is that of step 203 is less than the second threshold value, UE sends the second reporting message to base station, and the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message.
UE sends after the second reporting information to base station, and the indication that UE reception base station issues allows UE exit the information of closed-loop MIMO pattern, and UE is switched to open loop MIMO pattern from closed-loop MIMO pattern.
The method that the present embodiment provides can be carried out by UE.In the present embodiment, when UE enters after closed-loop MIMO pattern, UE continues to obtain the second optimum pre-coding matrix, when passing through the magnitude relationship of judgement the second invariant probability and the second threshold value, UE can determine whether to switch back open loop MIMO pattern from closed-loop MIMO pattern, compared with prior art, by UE, determined whether to be switched to open loop MIMO pattern from closed-loop MIMO pattern, can save the electric weight of base station and the resource of base station.
No matter it will be appreciated by those skilled in the art that, be FDD system, or TDD system, and UE can carry out embodiment as shown in Figure 2, thereby realize, switches Open-closed-loop MIMO pattern.Therefore, embodiment as shown in Figure 2 had both been applicable to FDD system, was applicable to again TDD system.
An alternative embodiment of the invention provides MIMO mode changing method, and the present embodiment has been described UE and entered closed-loop MIMO pattern from open loop MIMO pattern, and the process that enters open loop MIMO pattern from closed-loop MIMO pattern.In the present embodiment, UE obtains the first optimum pre-coding matrix, by carrying out Alpha filtering, according to the first optimum pre-coding matrix, obtain the first invariant probability, then from open loop MIMO pattern, enter closed-loop MIMO pattern, obtain again the second optimum pre-coding matrix, by carrying out Alpha filtering, according to the second optimum pre-coding matrix, obtain the second invariant probability equally, then from closed-loop MIMO pattern, enter open loop MIMO pattern, UE not only can enter 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 of Open-closed-loop MIMO pattern is all to be controlled by UE, the electric weight of base station and the resource of base station have also further been saved.
In the present embodiment, N is placed in bracket and as the some of parameter X, the form of X (N), represents N the parameter X of obtaining.For example, in the present embodiment, with PM_best, represent optimum pre-coding matrix,, with PM_best (N), represent N the optimum pre-coding matrix that UE obtains, N >=1.
In the present embodiment, with P_Con, represent invariant probability, as previously mentioned, whether identical P_Con refer between current PM_best and a upper PM_best probability, in the present embodiment, UE processes to optimum pre-coding matrix that to obtain invariant probability can be an Alpha filtering, specifically comprises:
Current invariant probability P_Con (N+1) value is: 1 and the absolute difference of filter factor Alpha and the product of a upper first invariant probability P_Con (N) be added again the value of gained with current probability coefficent P_Cur (N+1) and the product of filter factor Alpha, useful formula is described: * P_Con (the N)+Alpha*P_Cur (N+1) of P_Con (N+1)=(1-Alpha), the initial value P_Con (1)=0 of invariant probability wherein, PM_best for UE (N+1) and PM_best (N) compare, if equated, probability coefficent P_Cur (N+1) value is 1, otherwise P_Cur (N+1) value is 0, in order to guarantee that P_Con is one and is greater than zero probability, Alpha is greater than 0 and be less than or equal to arbitrary number of 1.
It should be noted that, UE can preset filter factor Alpha, also can under channel condition, carry out testing evaluation, thereby obtains Alpha.It will be appreciated by those skilled in the art that, the Alpha value obtaining according to different scenes and/or different channel condition UE may be different.By adjusting Alpha value, both can avoid because invariant probability is unstable, cause Open-closed-loop MIMO pattern frequently to be switched, thereby cause processing expenditure larger, can avoid again the time delay of Open-closed-loop MIMO pattern switch or do not switch.
Also it should be noted that, although in above-described embodiment, UE is according to invariant probability and relation corresponding to the threshold value of invariant probability, 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 according to closed loop gain, to above-described embodiment, modify according to actual needs, realize the switching of closed-loop MIMO pattern and open loop MIMO pattern, for example, UE gets after the first closed loop gain, by the first threshold value value corresponding to the first closed loop gain, it is the arbitrary value in 1 to M, wherein M is greater than arbitrary number of 2, by adjusting M according to the code word number of transmitting and the antenna number receiving and transmission, thereby adjust the first threshold value value, can increase the probability that UE can enter closed-loop MIMO pattern, when the first closed loop gain is not more than the first threshold value, UE keeps current open loop MIMO pattern, when the first closed loop gain is greater than the first threshold value, UE enters closed-loop MIMO pattern, UE gets after the second closed loop gain, by the second threshold value value of corresponding and the second closed loop gain, it is the arbitrary value in 1 to N, wherein N is greater than arbitrary number of 2, and the second threshold value is not more than the first threshold value, UE is by adjusting M according to the code word number of transmitting and the antenna number receiving and transmission, thereby adjust the second threshold value value, can prevent that Open-closed-loop MIMO pattern is switched frequently, thereby reduction processing expenditure, when the second closed loop gain is not less than the second threshold value, UE keeps current closed-loop MIMO pattern, when the second closed loop gain is less than corresponding to the second threshold value, UE enters open loop MIMO pattern.
Refer to Fig. 3, an alternative embodiment of the invention provides a kind of terminal equipment 30.This terminal equipment 30 can comprise the first acquiring unit 301, the first judging unit 302, the first Transmit-Receive Unit 303.Wherein,
The first acquiring unit 301, for obtaining the first optimum pre-coding matrix, obtains the first invariant probability according to the first optimum pre-coding matrix;
The first judging unit 302, for judging whether the first invariant probability that the first acquiring unit 301 obtains is greater than the first threshold value;
The first Transmit-Receive Unit 303, for when the first invariant probability is greater than the first threshold value, to base station, send the first reporting message, the request of carrying of the 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 the first acquiring unit 301 obtains the first invariant probability according to the first optimum pre-coding matrix, optional, the first acquiring unit 301, is 0 specifically for the initial value value of the first invariant probability; Optionally, the first acquiring unit 301, if equal a upper optimum pre-coding matrix specifically for current the first optimum pre-coding matrix, current probability coefficent value is 1; Or if current the first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, current probability coefficent value is 0.
When the first acquiring unit 301 obtains the first optimum pre-coding matrix, optionally, the first acquiring unit 302, specifically for using each pre-coding matrix in code book and the actual channel of eating dishes without rice or wine to do, mate, according to channel condition information, according to channel capacity, maximize and choose the best pre-coding matrix of matching effect as the first optimum pre-coding matrix.
Terminal equipment 30 in the present embodiment can be used in method that embodiment as shown in Figure 1 provides, carry out each action being realized by terminal equipment in the method, the parameter that terminal equipment in the present embodiment adopts also can, with reference to the explanation in the method, repeat no more herein.And the terminal equipment 30 in the present embodiment had both been applicable to FDD system, was applicable to again TDD system.
In the present embodiment, the first acquiring unit 301 can obtain the first optimum pre-coding matrix, then according to the first obtained optimum pre-coding matrix, obtain the first invariant probability, the first judging unit 302 is by the magnitude relationship of judgement the first invariant probability and the first threshold value, determine whether to enter closed-loop MIMO pattern, if, the first Transmit-Receive Unit 303 sends the first reporting message to base station, therefore terminal equipment 30 can enter closed-loop MIMO pattern when channel condition is applicable, and 30, terminal equipment is in the time entering closed-loop MIMO pattern, just to base station feedback, need to consume the first reporting message of the frequency spectrum resource of seldom eating dishes without rice or wine, saved the frequency spectrum resource of eating dishes without rice or wine.
Refer to Fig. 4, an alternative embodiment of the invention provides a kind of terminal equipment 40.This terminal equipment 40 comprises second acquisition unit 401, the second judging unit 402 and the second Transmit-Receive Unit 403.Wherein,
Optionally, second acquisition unit 401, specifically for using covariance matrix to do singular value decomposition, obtains the second optimum pre-coding matrix.
The second judging unit 402, for judging whether the second invariant probability is less than the second threshold value;
The second Transmit-Receive Unit 403, for when the second invariant probability is less than the second threshold value, sends the second reporting message to base station, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message, and the information of closed-loop MIMO pattern is exited in the indication that receives base station transmission;
Optionally, the terminal equipment 40 in the present embodiment also comprises switch unit 404, after entering the information of closed-loop MIMO pattern, enters closed-loop MIMO pattern for the indication receiving base station transmission; And/or, after the information of closed-loop MIMO pattern is exited in the indication that receives base station transmission, exit closed-loop MIMO pattern.
Terminal equipment 40 in the present embodiment can be used in method that embodiment as shown in Figure 2 provides, carry out each action being realized by terminal equipment in the method, the parameter that terminal equipment in the present embodiment adopts also can, with reference to the explanation in the method, repeat no more herein.And the terminal equipment 40 in the present embodiment had both been applicable to FDD system, was applicable to again TDD system.
In the present embodiment, when terminal equipment 40 enters after closed-loop MIMO pattern, second acquisition unit 401 obtains the second optimum pre-coding matrix, the second judging unit 402 is by the magnitude relationship of judgement the second invariant probability and the second threshold value, can determine whether to switch back open loop MIMO pattern from closed-loop MIMO pattern, compared with prior art, by terminal equipment 40, determined whether to switch back open loop MIMO pattern from closed-loop MIMO pattern, can save the electric weight of base station and the resource of base station.
Further, the embodiment of the present invention also provides a kind of terminal equipment, comprise the first acquiring unit 301, the first judging unit 302, the first Transmit-Receive Unit 303, and second acquisition unit 401, the second judging unit 402 and the second Transmit-Receive Unit 403, the function essence of the function of unit and corresponding unit in above-described embodiment is identical.In addition, this terminal equipment can also comprise switch unit 404, and its function is identical with the function essence of corresponding unit in above-described embodiment (being switch unit).
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the hardware that instruction is relevant to complete by program, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
The MIMO mode changing method and the terminal equipment that above the embodiment of the present invention are provided are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
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;
According to the first optimum pre-coding matrix, obtain the first invariant probability, wherein, whether identical described invariant probability represent between current optimum pre-coding matrix and a upper optimum pre-coding matrix probability;
Judge whether the first invariant probability is greater than the first threshold value;
If so, to base station, send the first reporting message, the request of carrying of the first reporting message enters the information of closed loop multiple-input and multiple-output MIMO pattern;
The indication that receives base station transmission enters the information of closed-loop MIMO pattern.
2. method according to claim 1, is characterized in that,
According to the first optimum pre-coding matrix, obtain the first invariant probability, comprising:
The initial value value of the first invariant probability is 0.
3. method according to claim 1 and 2, is characterized in that, according to the first optimum pre-coding matrix, obtains the first invariant probability, comprising:
If current the first optimum pre-coding matrix equals an optimum pre-coding matrix, current probability coefficent value is 1; Or
If current the first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, 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:
Each pre-coding matrix in use code book and the actual channel of eating dishes without rice or wine are done and are mated, and according to channel condition information, choose the best pre-coding matrix of matching effect as the first optimum pre-coding matrix.
5. method according to claim 4, is characterized in that, after receiving the step of information that indication that base station sends enters closed-loop MIMO pattern, also comprises:
Enter closed-loop MIMO pattern.
6. a MIMO mode changing method, is characterized in that, comprising:
Enter after closed loop multiple-input and multiple-output MIMO pattern, obtain the second optimum pre-coding matrix;
According to the second optimum pre-coding matrix, obtain the second invariant probability, wherein, whether identical described invariant probability represent between current optimum pre-coding matrix and a upper optimum pre-coding matrix probability;
Judge whether the second invariant probability is less than the second threshold value, if so, to base station, send the second reporting message, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message;
The information of closed-loop MIMO pattern is exited in the indication that receives 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 the method described in claim 6 or 7, it is characterized in that, receive after indication that base station sends exits the step of information of closed-loop MIMO pattern, also comprise:
Exit closed-loop MIMO pattern.
9. a terminal equipment, is applied to communication technical field, it is characterized in that, comprising:
The first acquiring unit, be used for obtaining the first optimum pre-coding matrix, according to the first optimum pre-coding matrix, obtain the first invariant probability, wherein, whether identical described invariant probability represent between current optimum pre-coding matrix and a upper optimum pre-coding matrix probability;
The first judging unit, for judging whether the first invariant probability that described the first acquiring unit obtains is greater than the first threshold value;
The first Transmit-Receive Unit, for when the first invariant probability is greater than the first threshold value, to base station, send the first reporting message, the request of carrying of the 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 the first acquiring unit is 0 specifically for the initial value value of the first invariant probability.
11. according to the terminal equipment described in claim 9 or 10, it is characterized in that,
Described the first acquiring unit, if equal a upper optimum pre-coding matrix specifically for current the first optimum pre-coding matrix, current probability coefficent value is 1; Or if current the first optimum pre-coding matrix is not equal to an optimum pre-coding matrix, current probability coefficent value is 0.
12. terminal equipments according to claim 11, is characterized in that,
Described the first acquiring unit, mates specifically for using each pre-coding matrix in code book and the actual channel of eating dishes without rice or wine to do, and according to channel condition information, chooses the best pre-coding matrix of matching effect as the first optimum pre-coding matrix.
13. 1 kinds of terminal equipments, are applied to communication technical field, it is characterized in that, comprising:
Second acquisition unit, for entering after closed-loop MIMO pattern at terminal equipment, obtains the second optimum pre-coding matrix; According to the second optimum pre-coding matrix, obtain the second invariant probability, wherein, whether identical described invariant probability represent between current optimum pre-coding matrix and a upper optimum pre-coding matrix probability;
The second judging unit, for judging whether the second invariant probability is less than the second threshold value;
The second Transmit-Receive Unit, for when the second invariant probability is less than the second threshold value, sends the second reporting message to base station, the information of closed-loop MIMO pattern is exited in the request of carrying of the second reporting message, and the information of closed-loop MIMO pattern is exited in the indication that receives base station transmission.
14. terminal equipments according to claim 13, is characterized in that,
Described second acquisition unit, specifically for using covariance matrix to do singular value decomposition, obtains the second optimum pre-coding matrix.
15. according to the terminal equipment described in claim 13 or 14, it is characterized in that, also comprises:
Switch unit, after entering the information of closed-loop MIMO pattern, enters closed-loop MIMO pattern for the indication receiving base station transmission; And/or
After the information of closed-loop MIMO pattern is exited in the indication that receives base station transmission, exit closed-loop MIMO pattern.
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| CN201110028691.2A CN102055567B (en) | 2011-01-26 | 2011-01-26 | MIMO (Multiple Input Multiple Output) mode switching method and terminal equipment |
| PCT/CN2012/070736 WO2012100745A1 (en) | 2011-01-26 | 2012-01-29 | Multi-input multi-output mode switching method and user equipment |
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| US8644181B2 (en) * | 2011-08-16 | 2014-02-04 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method and apparatus for estimation of channel temporal correlation and MIMO mode selection in LTE system |
| CN103138821B (en) | 2011-11-30 | 2017-02-08 | 华为技术有限公司 | Method, device and system for data transmission |
| CN104486041B (en) * | 2012-04-11 | 2018-06-05 | 华为技术有限公司 | A kind of transmission mode collocation method and device |
| CN103596653B (en) * | 2013-01-10 | 2016-12-21 | 华为技术有限公司 | A kind of transmission mode collocation method and base station |
| WO2018232734A1 (en) | 2017-06-23 | 2018-12-27 | Qualcomm Incorporated | Transmission strategy signaling |
| WO2021179266A1 (en) * | 2020-03-12 | 2021-09-16 | 北京小米移动软件有限公司 | Multiple-input multiple-output mode configuration method and apparatus, and storage medium |
| CN115412114B (en) * | 2022-07-26 | 2024-02-23 | 中国电信股份有限公司 | Different system interference processing method and device, electronic equipment and storage medium |
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| US8351544B2 (en) * | 2008-12-15 | 2013-01-08 | Motorola Mobility Llc | Method and apparatus for codebook-based feedback in a closed loop wireless communication system |
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