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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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- 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
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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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 invention relates to the technical field of communication, in particular to a multi-input multi-output mode switching method and terminal equipment.
Background
In order to obtain higher spectral efficiency and system capacity, cellular mobile communication systems of the super-Third Generation mobile communication system (B3G, Beyond Third Generation in mobile communication system) and the fourth Generation mobile communication system (4G, Forth Generation in mobile communication system) represented by Frequency Division Duplex (FDD) systems based on Long Term Evolution (LTE) generally employ multiple-Input multiple-Output (MIMO) technology, which can be divided into two modes, an open-loop MIMO mode and a closed-loop MIMO mode, when a terminal device (UE) is in the closed-loop mode, a Precoding Matrix Indicator (PMI) is continuously reported to a base station, so that the PMI of the base station can weight each antenna for transmitting data according to a selected weighting matrix of the UE, when the UE is in the open-loop mode, the PMI is not reported to the base station, the base station does not have weighted value or adds random weighted value to the data transmitted by each antenna, although the closed loop MIMO mode can obtain higher spectrum efficiency compared with the open loop MIMO mode, because the channel condition in the system is changed, the system can not adopt the closed loop MIMO mode all the time, but can only self-adaptively switch the open loop MIMO mode and the closed loop MIMO mode according to the channel condition.
In the prior art, a B3G/4G cellular mobile communication system implements a procedure for adaptively switching an open-loop MIMO mode and a closed-loop MIMO mode according to channel conditions, which is specifically as follows:
after the UE accesses the network, the base station judges whether the UE has the possibility of entering the closed-loop MIMO mode according to preset conditions (such as channel quality), if so, the UE is required to feed back a PMI to the base station, the base station processes the PMI fed back by the UE, whether the UE can enter the closed-loop MIMO mode is judged according to the processing result, if not, the base station indicates the UE to stop feeding back the PMI, if so, the base station indicates the UE to enter the closed-loop MIMO mode, the base station continues to process the PMI fed back by the UE until the judgment result that the UE cannot enter the closed-loop MIMO mode is obtained, and the base station indicates the UE.
Although the base station may determine in advance whether the UE may enter the closed-loop MIMO mode, and then require the UE to feed back the PMI to the base station, a result of the PMI processing performed by the base station may still be that the UE cannot enter the closed-loop MIMO mode, so that the PMI fed back by the UE to the base station wastes air interface spectrum resources.
Disclosure of Invention
The embodiment of the invention provides a multi-input multi-output mode switching method and a base station.
A multiple-input multiple-output mode switching method comprises the following steps: acquiring a first optimal precoding matrix; acquiring a first invariant probability according to the first optimal pre-coding matrix; judging whether the first invariant probability is larger than a first threshold value or not; if so, sending a first report message to the base station, wherein the first report message carries information requesting to enter a closed-loop multiple-input multiple-output (MIMO) mode; and receiving information which is sent by the base station and indicates to enter a closed loop MIMO mode.
A multiple-input multiple-output mode switching method comprises the following steps: after entering a closed-loop multi-input multi-output MIMO mode, acquiring a second optimal precoding matrix; acquiring a second invariant probability according to a second optimal pre-coding matrix; judging whether the second invariant probability is smaller than a second threshold value, if so, sending a second report message to the base station, wherein the second report message carries information requesting to exit the closed-loop MIMO mode; and receiving information which is sent by the base station and indicates to exit the closed-loop MIMO mode.
A terminal device, comprising: the first obtaining unit is used for obtaining a first optimal precoding matrix and obtaining a first invariant probability according to the first optimal precoding matrix; a first judging unit, configured to judge whether the first invariant probability acquired by the first acquiring unit is greater than a first threshold; the first transceiver unit is configured to send a first report message to the base station when the first invariant probability is greater than a first threshold, where the first report message carries information requesting to enter the closed-loop MIMO mode, and receive information indicating to enter the closed-loop MIMO mode, where the information is sent by the base station.
A terminal device, comprising: the second obtaining unit is used for obtaining a second optimal precoding matrix after the terminal equipment enters a closed-loop MIMO mode; acquiring a second invariant probability according to a second optimal pre-coding matrix; a second judging unit, configured to judge whether the second invariant probability is smaller than a second threshold; and the second transceiver unit is configured to send a second report message to the base station when the second invariant probability is smaller than a second threshold, where the second report message carries information requesting to exit the closed-loop MIMO mode, and receive information indicating to exit the closed-loop MIMO mode, where the information is sent by the base station.
In the embodiment of the invention, the UE can obtain the first optimal precoding matrix, then the first invariant probability is obtained according to the obtained first optimal precoding matrix, the UE determines whether the closed-loop MIMO mode can be entered or not by judging the magnitude relation between the first invariant probability and the first threshold value, if so, the UE sends the first report message to the base station, so that the UE can enter the closed-loop MIMO mode when the channel condition is proper, and the UE feeds back the first report message which consumes few air interface spectrum resources to the base station only when the UE can enter the closed-loop MIMO mode, thereby saving the air interface spectrum resources.
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Fig. 1 is a schematic flowchart of a mimo mode switching method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a mimo mode switching method according to another embodiment of the present invention;
fig. 3 is a schematic logical structure diagram of a terminal device according to an embodiment of the present invention;
fig. 4 is a schematic logical structure diagram of a terminal device according to another embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for switching a multi-input multi-output mode, and further provides corresponding terminal equipment, which are respectively described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a method for switching between MIMO modes, where a UE is capable of determining whether to switch from an open-loop MIMO mode to a closed-loop MIMO mode, and the method includes:
101. acquiring a first optimal precoding matrix;
in the MIMO system, for the configuration of each transmit antenna, a set of Precoding Matrices (PMs) may be established, and both the base station and the UE know the set, where the set of matrices is referred to as MIMO codebook, and once the codebook used by the MIMO system is determined, the UE observes the channel condition and selects an optimal Precoding Matrix.
The method for acquiring the optimal precoding matrix by the UE comprises the following two steps:
1. the UE uses each precoding matrix in the codebook to match with an actual air interface Channel according to a certain rule, and selects a precoding matrix with the best matching effect, namely an optimal precoding matrix according to Channel State Information (CSI). The UE may determine a matching effect between the precoding matrix and the actual air interface channel according to the error probability or throughput of the system, and when the error probability or throughput of the system is the minimum or the throughput is the maximum, the matching effect between the precoding matrix that is currently matched and the actual air interface channel is considered to be the best, and the precoding matrix is the optimal precoding matrix.
2. The UE may also obtain the optimal precoding matrix by direct calculation, for example, the UE may first perform Singular Value Decomposition (SVD) or eigenvalue Decomposition using a covariance matrix or a channel matrix to obtain a precoding matrix. If the codebook has the precoding matrix, the precoding matrix is the optimal precoding matrix, and if the codebook does not have the precoding matrix, the UE searches the codebook for the precoding matrix most similar to the calculated precoding matrix, and takes the precoding matrix found from the codebook as the optimal precoding matrix.
In the embodiment of the present invention, the UE may obtain the first optimal precoding matrix by using the above method. It should be noted that the first optimal precoding matrix does not represent a limitation on the order of the optimal precoding matrix.
102. Acquiring a first invariant probability according to the first optimal pre-coding matrix;
and after the UE acquires the first optimal precoding matrix, acquiring a first invariant probability according to the first optimal precoding matrix. Herein, the invariant probability denotes a probability of whether or not the current optimal precoding matrix is the same as the last optimal precoding matrix. The initial value of the first invariant probability may take the value 0.
The first invariant probability does not indicate a limitation on the order of the invariant probabilities.
103. Judging whether the first invariant probability is larger than a first threshold value, if not, executing a step 104, and if so, executing a step 105;
in this step, the UE may preset the first threshold, or perform test evaluation under the channel condition, so as to obtain the first threshold. As will be appreciated by those skilled in the art, the first threshold value obtained by the UE may be different according to different scenarios and/or different channel conditions. For example, according to the definition of the invariant probability, the first threshold value is any value from 1/N to 1, where N is the number of precoding matrices in the codebook, and the probability that the UE can enter the closed-loop MIMO mode can be increased by adjusting the value of the first threshold value from large to small.
It should be noted that the first threshold does not indicate the order of limiting the threshold.
It should be noted that, when the UE is just entering the network, the UE firstly adopts the open-loop MIMO mode because the open loop does not need to use the air interface channel characteristics between the base station and the UE.
If the first invariant probability is not greater than the first threshold, the UE may learn: if the closed-loop MIMO mode cannot be realized according to the current channel condition, the UE performs step 104 to maintain the current open-loop MIMO mode.
If the first invariant probability is greater than the first threshold, the UE may learn: a closed loop MIMO mode may be implemented according to the current channel conditions, and the UE performs step 105, and enters the closed loop MIMO mode, thereby obtaining higher spectral efficiency.
104. Keeping the current open-loop MIMO mode and returning to the step 101;
when the first invariant probability is not greater than the first threshold as a result of the determination in step 103, the UE maintains the current open-loop MIMO mode, and the UE performs step 101 again.
105. Sending a first report message to a base station, wherein the first report message carries information requesting to enter a closed-loop MIMO mode;
when the judgment result of step 103 is that the first invariant probability is greater than the first threshold, the UE sends a first report message to the base station, where the first report message carries information requesting to enter the closed-loop MIMO mode.
After the UE sends the first reported information to the base station, the UE receives information which is sent by the base station and indicates that the UE enters a closed-loop MIMO mode, the UE is switched from the open-loop MIMO mode to the closed-loop MIMO mode, and the UE continuously feeds back a PMI to the base station in the closed-loop MIMO mode, so that the base station can select a weighting proof to weight transmitting data of each antenna according to the PMI fed back by the UE, and the base station can gather more transmitting energy to the UE.
The method provided by this embodiment may be executed by a UE, where the UE may obtain a first optimal precoding matrix, and then obtain a first invariant probability according to the obtained first optimal precoding matrix, and the UE determines whether to enter a closed-loop MIMO mode by judging a magnitude relationship between the first invariant probability and a first threshold, and if so, sends a first report message to a base station, so that the UE may enter the closed-loop MIMO mode when a channel condition is suitable, and only when the UE can enter the closed-loop MIMO mode, the UE feeds back the first report message that consumes few air interface spectrum resources to the base station, thereby saving the air interface spectrum resources.
It will be understood by those skilled in the art that the UE can implement the above-described embodiments to implement the switched open-closed loop MIMO mode, whether FDD or Time Division Duplex (TDD) system. Therefore, the above embodiments are applicable to both FDD and TDD systems.
Referring to fig. 2, another embodiment of the invention provides a method for switching between mimo modes. In this embodiment, after the UE enters the closed-loop MIMO mode, the system may further determine whether the UE is to switch back to the open-loop MIMO mode from the closed-loop MIMO mode. The present embodiment may include the following steps:
201. acquiring a second optimal precoding matrix;
and after the UE enters a closed-loop MIMO mode, the UE acquires a second optimal precoding matrix. It should be noted that the second optimal precoding matrix does not represent a limitation on the order of the optimal precoding matrix. The method for the UE to obtain the second optimal precoding matrix may be the same as the method for the UE to obtain the first optimal precoding matrix, and is not repeated here.
202. Acquiring a second invariant probability according to a second optimal pre-coding matrix;
and the UE acquires a second invariant probability according to the second optimal precoding matrix.
The second invariant probability does not indicate a limitation on the order of the invariant probabilities.
203. And judging whether the second invariant probability is smaller than a second threshold value, if not, executing a step 204, and if so, executing a step 205.
In this step, the UE may preset a second threshold, set the second threshold to be not greater than the first threshold, and perform test evaluation under the channel condition, so as to obtain the second threshold. For example, according to the definition of the invariant probability, the second threshold value is any value from 1/N to 1, where N is the number of precoding matrices in the codebook, and by adjusting the second threshold value, frequent switching of the MIMO mode of the open-closed loop can be prevented, thereby reducing the processing overhead.
If the second invariant probability is not less than the second threshold, the UE may learn: if the UE can still implement the closed-loop MIMO mode according to the current channel condition, the UE performs step 204 to maintain the current closed-loop MIMO mode.
If the second invariant probability is smaller than the second threshold, the UE may know: depending on the current channel conditions, the closed loop MIMO mode cannot be achieved, the UE performs step 205, and the UE enters the open loop MIMO mode.
204. The current closed loop MIMO mode is maintained and step 201 is performed again;
when the determination result in step 208 is that the second invariant probability is not smaller than the first threshold, the UE maintains the current closed-loop MIMO mode, and the UE performs step 201 again.
205. And sending a second report message to the base station, wherein the second report message carries information for requesting to exit the closed-loop MIMO mode.
And when the judgment result in the step 203 is that the second invariant probability is smaller than the second threshold, the UE sends a second report message to the base station, where the second report message carries information requesting to exit the closed-loop MIMO mode.
And after the UE sends the second reporting information to the base station, the UE receives the information which is sent by the base station and indicates that the UE exits the closed-loop MIMO mode, and the UE is switched from the closed-loop MIMO mode to the open-loop MIMO mode.
The method provided by the embodiment can be executed by the UE. In this embodiment, after the UE enters the closed-loop MIMO mode, the UE continues to obtain the second optimal precoding matrix, and when the UE determines that the second invariant probability is related to the second threshold, the UE may determine whether to switch from the closed-loop MIMO mode to the open-loop MIMO mode.
Those skilled in the art will appreciate that the UE can perform the embodiment shown in fig. 2 to implement switching between the open and closed loop MIMO modes, whether FDD or TDD. Thus, the embodiment shown in fig. 2 is applicable to both FDD and TDD systems.
Another embodiment of the present invention provides a MIMO mode switching method, and this embodiment describes a process in which a UE enters a closed-loop MIMO mode from an open-loop MIMO mode, and enters the open-loop MIMO mode from the closed-loop MIMO mode. In this embodiment, the UE obtains a first optimal precoding matrix, obtains a first invariant probability according to the first optimal precoding matrix by performing an Alpha filtering process, then enters a closed-loop MIMO mode from the open-loop MIMO mode, obtains a second optimal precoding matrix, obtains a second invariant probability according to the second optimal precoding matrix by performing the Alpha filtering process, and then enters the open-loop MIMO mode from the closed-loop MIMO mode.
In this embodiment, N is placed in parentheses and is used as a part of the parameter X, i.e., in the form of X (N), which indicates the nth parameter X obtained. For example, in this embodiment, PM _ best is used to represent the optimal precoding matrix, and PM _ best (N) is used to represent the nth optimal precoding matrix acquired by the UE, where N ≧ 1.
In this embodiment, P _ Con is used to represent the invariant probability, and as described above, P _ Con refers to whether the current PM _ best is the same as the last PM _ best, and in this embodiment, the obtaining of the invariant probability by the UE processing the optimal precoding matrix may be an Alpha filtering process, which specifically includes:
the current invariant probability P _ Con (N +1) takes the values: the value obtained by adding the product of the absolute difference value between 1 and the filter coefficient Alpha and the last first invariant probability P _ con (N) to the product of the current probability coefficient P _ Cur (N +1) and the filter coefficient Alpha can be described by the following formula: p _ Con (N +1) ((1-Alpha) × P _ Con (N)) + Alpha × P _ Cur (N +1), wherein the initial value of the invariant probability P _ Con (1) ═ 0, the UE compares with PM _ best (N +1) and PM _ best (N), if equal, the probability coefficient P _ Cur (N +1) takes the value 1, otherwise P _ Cur (N +1) takes the value 0, in order to guarantee that P _ Con is a probability greater than zero, Alpha is any number greater than 0 and less than or equal to 1.
It should be noted that the UE may preset a filter coefficient Alpha, and may also perform test evaluation under the channel condition, so as to obtain the Alpha. Those skilled in the art will appreciate that the Alpha values obtained by the UE may be different according to different scenarios and/or different channel conditions. By adjusting the Alpha value, the frequent switching of the open-closed loop MIMO mode caused by unstable invariant probability can be avoided, so that the processing cost is high, and the delayed switching or non-switching of the open-closed loop MIMO mode can be avoided.
It should be further noted that, although in the foregoing embodiment, the UE performs switching between the closed-loop MIMO mode and the open-loop MIMO mode according to the relationship between the invariant probability and the threshold corresponding to the invariant probability, the UE may also perform switching between the closed-loop MIMO mode and the open-loop MIMO mode according to the relationship between the closed-loop gain and the threshold corresponding to the closed-loop gain, for example, after acquiring the first closed-loop gain, the UE may modify the foregoing embodiment according to the actual need to implement switching between the closed-loop MIMO mode and the open-loop MIMO mode, where M is any number greater than 2, and adjust the first threshold value by adjusting M according to the number of antennas transmitted and received and the number of codewords transmitted, the probability that the UE can enter the closed-loop MIMO mode may be increased, and when the first closed-loop gain is not greater than the first threshold value, the UE maintains the current open-loop MIMO mode, when the first closed-loop gain is larger than the first threshold value, the UE enters a closed-loop MIMO mode, after the UE acquires the second closed-loop gain, the second threshold value corresponding to the second closed-loop gain is set to be any one value from 1 to N, wherein N is any number greater than 2, and the second threshold is not greater than the first threshold, the UE adjusts M according to the number of the antennas for transmitting and receiving and the number of the transmitted code words, thereby adjusting the value of the second threshold value, preventing frequent switching of MIMO modes of the open-close loop, thereby reducing the processing overhead, when the second closed-loop gain is not less than the second threshold value, the UE maintains the current closed-loop MIMO mode, and when the second closed-loop gain is smaller than the second threshold value, the UE enters an open-loop MIMO mode.
Referring to fig. 3, another embodiment of the invention provides a terminal device 30. The terminal device 30 may include a first acquiring unit 301, a first determining unit 302, and a first transceiving unit 303. Wherein,
a first obtaining unit 301, configured to obtain a first optimal precoding matrix, and obtain a first invariant probability according to the first optimal precoding matrix;
a first judging unit 302, configured to judge whether the first invariant probability acquired by the first acquiring unit 301 is greater than a first threshold;
the first transceiving unit 303 is configured to send a first reporting message to the base station when the first invariant probability is greater than a first threshold, where the first reporting message carries information requesting to enter the closed-loop MIMO mode, and receive information indicating that the closed-loop MIMO mode is entered and sent by the base station.
When the first obtaining unit 301 obtains the first invariant probability according to the first optimal precoding matrix, optionally, the first obtaining unit 301 is specifically configured to obtain an initial value of the first invariant probability as 0; optionally, the first obtaining unit 301 is specifically configured to, if the current first optimal precoding matrix is equal to the last optimal precoding matrix, take a current probability coefficient to be 1; or, if the current first optimal precoding matrix is not equal to the last optimal precoding matrix, the current probability coefficient takes a value of 0.
When the first obtaining unit 301 obtains the first optimal precoding matrix, optionally, the first obtaining unit 302 is specifically configured to match each precoding matrix in the codebook with an actual air interface channel, and select the precoding matrix with the best matching effect as the first optimal precoding matrix according to the channel state information and according to the channel capacity maximization.
The terminal device 30 in this embodiment may be used in the method provided in the embodiment shown in fig. 1, that is, each action implemented by the terminal device in the method is executed, and the parameters used by the terminal device in this embodiment may also refer to the description in the method, which is not described herein again. Moreover, the terminal device 30 in the present embodiment is applicable to both an FDD system and a TDD system.
In this embodiment, the first obtaining unit 301 may obtain a first optimal precoding matrix, and then obtain a first invariant probability according to the obtained first optimal precoding matrix, the first determining unit 302 determines whether the closed-loop MIMO mode can be entered by determining a size relationship between the first invariant probability and a first threshold, and if so, the first transceiver unit 303 sends a first report message to the base station, so that the terminal device 30 may enter the closed-loop MIMO mode when the channel condition is suitable, and the terminal device 30 feeds back the first report message that needs to consume few air interface spectrum resources to the base station only when the terminal device 30 can enter the closed-loop MIMO mode, thereby saving the air interface spectrum resources.
Referring to fig. 4, another embodiment of the present invention provides a terminal device 40. The terminal device 40 includes a second acquisition unit 401, a second determination unit 402, and a second transceiving unit 403. Wherein,
a second obtaining unit 401, configured to obtain a second optimal precoding matrix; acquiring a second invariant probability according to a second optimal pre-coding matrix;
optionally, the second obtaining unit 401 is specifically configured to use the covariance matrix to perform singular value decomposition, so as to obtain a second optimal precoding matrix.
A second judging unit 402, configured to judge whether the second invariant probability is smaller than a second threshold;
a second transceiving unit 403, configured to send a second reporting message to the base station when the second invariant probability is smaller than a second threshold, where the second reporting message carries information requesting to exit the closed-loop MIMO mode, and receives information indicating to exit the closed-loop MIMO mode, where the information is sent by the base station;
optionally, the terminal device 40 in this embodiment further includes a switching unit 404, configured to enter the closed-loop MIMO mode after receiving the information that indicates to enter the closed-loop MIMO mode and is sent by the base station; and/or exiting the closed-loop MIMO mode after receiving information sent by the base station indicating exiting the closed-loop MIMO mode.
The terminal device 40 in this embodiment may be used in the method provided in the embodiment shown in fig. 2, that is, each action implemented by the terminal device in the method is executed, and the parameters used by the terminal device in this embodiment may also refer to the description in the method, which is not described herein again. The terminal device 40 in this embodiment is applicable to both the FDD system and the TDD system.
In this embodiment, after the terminal device 40 enters the closed-loop MIMO mode, the second obtaining unit 401 obtains the second optimal precoding matrix, and the second determining unit 402 determines whether to switch from the closed-loop MIMO mode to the open-loop MIMO mode by determining the magnitude relationship between the second invariant probability and the second threshold.
Further, an embodiment of the present invention further provides a terminal device, which includes a first obtaining unit 301, a first determining unit 302, a first transceiving unit 303, a second obtaining unit 401, a second determining unit 402, and a second transceiving unit 403, where functions of each unit are substantially the same as those of corresponding units in the foregoing embodiments. Further, the terminal device may further include a switching unit 404, the function of which is substantially the same as that of the corresponding unit (i.e., switching unit) in the above-described embodiment.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The mimo mode switching method and the terminal device provided by the embodiments of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the embodiments of the present invention, and the description of the embodiments above is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (15)
1. A MIMO mode switching method, comprising:
acquiring a first optimal precoding matrix;
acquiring a first invariant probability according to a first optimal precoding matrix, wherein the invariant probability represents the probability of whether the current optimal precoding matrix is the same as the last optimal precoding matrix;
judging whether the first invariant probability is larger than a first threshold value or not;
if so, sending a first report message to the base station, wherein the first report message carries information requesting to enter a closed-loop multiple-input multiple-output (MIMO) mode;
and receiving information which is sent by the base station and indicates to enter a closed loop MIMO mode.
2. The method of claim 1,
acquiring a first invariant probability according to the first optimal precoding matrix, comprising:
the initial value of the first invariant probability takes the value 0.
3. The method of claim 1 or 2, wherein obtaining the first invariant probability according to the first optimal precoding matrix comprises:
if the current first optimal pre-coding matrix is equal to the last optimal pre-coding matrix, the current probability coefficient takes the value of 1; or
And if the current first optimal precoding matrix is not equal to the last optimal precoding matrix, the current probability coefficient value is 0.
4. The method of claim 3,
acquiring a first optimal precoding matrix, specifically including:
and matching each pre-coding matrix in the codebook with an actual air interface channel, and selecting the pre-coding matrix with the best matching effect as a first optimal pre-coding matrix according to the channel state information.
5. The method of claim 4, wherein the step of receiving the information indicating the entering of the closed-loop MIMO mode sent by the base station is followed by:
a closed loop MIMO mode is entered.
6. A multiple-input multiple-output mode switching method is characterized by comprising the following steps:
after entering a closed-loop multi-input multi-output MIMO mode, acquiring a second optimal precoding matrix;
acquiring a second invariant probability according to a second optimal precoding matrix, wherein the invariant probability represents the probability of whether the current optimal precoding matrix is the same as the last optimal precoding matrix;
judging whether the second invariant probability is smaller than a second threshold value, if so, sending a second report message to the base station, wherein the second report message carries information requesting to exit the closed-loop MIMO mode;
and receiving information which is sent by the base station and indicates to exit the closed-loop MIMO mode.
7. The method of claim 6,
acquiring a second optimal precoding matrix, specifically including:
and performing singular value decomposition by using the covariance matrix to obtain a second optimal precoding matrix.
8. The method of claim 6 or 7, wherein after the step of receiving the information indicating the exit from the closed-loop MIMO mode sent by the base station, further comprising:
the closed loop MIMO mode is exited.
9. A terminal device is applied to the technical field of communication, and is characterized by comprising:
a first obtaining unit, configured to obtain a first optimal precoding matrix, and obtain a first invariant probability according to the first optimal precoding matrix, where the invariant probability indicates whether a current optimal precoding matrix is the same as a last optimal precoding matrix;
a first judging unit, configured to judge whether the first invariant probability acquired by the first acquiring unit is greater than a first threshold;
and the first transceiver unit is used for sending a first reporting message to the base station when the first invariant probability is greater than a first threshold value, wherein the first reporting message carries information requesting to enter the closed-loop MIMO mode, and receiving information which is sent by the base station and indicates to enter the closed-loop MIMO mode.
10. The terminal device of claim 9,
the first obtaining unit is specifically configured to obtain an initial value of the first invariant probability as 0.
11. The terminal device according to claim 9 or 10,
the first obtaining unit is specifically configured to, if the current first optimal precoding matrix is equal to the last optimal precoding matrix, take a current probability coefficient to be 1; or, if the current first optimal precoding matrix is not equal to the last optimal precoding matrix, the current probability coefficient takes a value of 0.
12. The terminal device of claim 11,
the first obtaining unit is specifically configured to match each precoding matrix in the codebook with an actual air interface channel, and select a precoding matrix with a best matching effect as a first optimal precoding matrix according to the channel state information.
13. A terminal device is applied to the technical field of communication, and is characterized by comprising:
the second obtaining unit is used for obtaining a second optimal precoding matrix after the terminal equipment enters a closed-loop MIMO mode; acquiring a second invariant probability according to a second optimal precoding matrix, wherein the invariant probability represents the probability of whether the current optimal precoding matrix is the same as the last optimal precoding matrix;
a second judging unit, configured to judge whether the second invariant probability is smaller than a second threshold;
and the second transceiver unit is used for sending a second reporting message to the base station when the second invariant probability is smaller than a second threshold value, wherein the second reporting message carries information requesting to exit the closed-loop MIMO mode, and receives information indicating to exit the closed-loop MIMO mode, which is sent by the base station.
14. The terminal device of claim 13,
the second obtaining unit is specifically configured to use the covariance matrix to perform singular value decomposition to obtain a second optimal precoding matrix.
15. The terminal device according to claim 13 or 14, further comprising:
the switching unit is used for entering the closed-loop MIMO mode after receiving the information which is sent by the base station and indicates to enter the closed-loop MIMO mode; and/or
The closed-loop MIMO mode is exited after receiving information sent by the base station indicating an exit from the closed-loop MIMO mode.
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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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| CN102055567B (en) * | 2011-01-26 | 2014-04-02 | 上海华为技术有限公司 | MIMO (Multiple Input Multiple Output) mode switching method and terminal equipment |
| 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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| KR101578135B1 (en) * | 2008-08-29 | 2015-12-16 | 삼성전자주식회사 | Apparatus and method for transmitting and receiving fast feedback information in a broadband wireless communication system |
| 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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