WO2014187140A1

WO2014187140A1 - Method and apparatus for switching transmission mode, and computer storage medium

Info

Publication number: WO2014187140A1
Application number: PCT/CN2013/090928
Authority: WO
Inventors: 姚春峰; 付瑞颖
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-05-23
Filing date: 2013-12-30
Publication date: 2014-11-27
Also published as: CN104185206B; JP6073026B2; CN104185206A; RU2615998C1; JP2016524381A

Abstract

Disclosed are a method and an apparatus for switching a transmission mode, and a computer storage medium. The method comprises: determining a weighting function expression used for transmission mode switching; estimating a value of each variable in the weighting function expression according to measurement information of a base station side and reporting information and scheduling information of a terminal side; and calculating a value of the weighting function expression in each transmission mode, determining that a transmission mode corresponding to a maximum value or a minimum value among the values of the weighting function expression is a switchable transmission mode, and switching the transmission mode.

Description

Method and device for switching transmission mode, computer storage medium

The present invention relates to the field of long communication, and in particular, to a method and device for switching a transmission mode, and a computer storage medium. Background technique

In order to match different application scenarios, multiple transmission modes coexist in the communication system, and adaptive selection of the optimal transmission mode becomes the key to improving system performance according to the characteristics of the application scenario. In the prior art, the transmission mode is generally switched by using information such as speed, channel correlation, signal-to-noise ratio, and spectral efficiency, and the acquisition of the information is usually implemented by means of base station side estimation or terminal reporting.

Among them, for the method of estimating the base station side, there is a problem that some information cannot be estimated on the base station side, for example: For Beamforming (BF) technology, the protocol specifies a client-specific reference signal (UE-Specific Reference) Signals, UE-SRS) for channel estimation; and for the Space Frequency Block Code (SFBC) technology, the protocol specifies Cell-specific Reference Signals (CRS) for channel estimation, due to the pilot structure. The difference between the channel and the terminal channel estimation method may be different. Therefore, the system performance difference cannot be accurately estimated by the base station side, and thus the handover accuracy is affected.

For the way the terminal reports, the following problems exist: First, some information protocols do not support reporting; secondly, when the information reported by the terminal is inaccurate, it not only affects the accuracy of the handover, but also causes the system performance to degrade. Summary of the invention

In view of this, the embodiment of the present invention provides a transmission for solving the problems existing in the prior art. The switching method and device of the transmission mode and the computer storage medium can be accurately switched, and the throughput of the system can be improved.

The technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a method for switching a transmission mode, where the method includes: determining a weighting function expression for transmission mode switching; estimating each transmission according to measurement information of the base station side and reporting information and scheduling information of the terminal side. a value of each variable in the weighting function expression in a mode; calculating a value of the weighting function expression in each of the transmission modes; determining a maximum value or a maximum value of the value of the weighting function expression The transmission mode is a switchable transmission mode, and the transmission mode is switched.

Preferably, the calculating the value of the weighting function expression in each of the transmission modes comprises: dividing a transmission mode set according to the value of each variable in the weighting function expression in each estimated transmission mode; The transmission mode set ₃ to be tried is attempted to be scheduled according to a scheduling pattern in a scheduling window, and the values of the variables in the weighting function expression are obtained; each of the transmission mode sets ₂ for calculating all the information required for the divided transmission mode switching is calculated. The value of the weighting function expression in the transmission mode; and calculating the value of the weighting function expression of the various transmission modes in the transmission mode set Γ ₃ according to the obtained values of the variables in the weighting function expression.

Preferably, the scheduling pattern comprises: a scheduling pattern 1: cyclically scheduling each transmission mode in the transmission mode set Γ ₃ in sequence or in reverse order; scheduling pattern 2: sequentially performing the transmission mode in order or in reverse order Each transmission mode in the set Γ ₃ is cyclically scheduled, and the number of consecutive schedulings per round in each transmission mode is greater than one time; scheduling pattern three: odd-numbered rounds sequentially for each of the transmission mode sets Γ ₃ in order or in reverse order transmission scheduling modes, the even-numbered round in the reverse order or the order of each transmission mode in order to schedule ₃ set the transmission mode; scheduling four patterns: the odd-order or reverse gear of the transmission mode set in each Gamma] ₃ The transmission modes are scheduled, and the even rounds schedule each transmission mode in the transmission mode set ₃ in reverse order or in order, and the number of consecutive schedulings per round in each transmission mode is greater than one. Preferably, each variable in the weighting function expression includes spectral efficiency, block error rate, packet loss rate, and interference generated by neighboring cells.

Preferably, the measurement information of the base station side includes: channel estimation information and channel measurement information; the report information of the terminal side includes: a channel quality indicator, a precoding matrix indication, and a rank indication; and the scheduling information of the terminal side includes: The number of scheduling, the scheduling modulation and coding scheme, and the scheduled transmission mode.

Preferably, the method further comprises: when there are multiple transmission modes corresponding to the maximum value or the minimum value of the weighting function expression, determining the switchable transmission mode according to a random selection or a fixed order.

The embodiment of the present invention further provides a transmission mode switching apparatus, where the apparatus includes a determining unit, an estimating unit, a first calculating unit, and a switching unit, where the determining unit is configured to determine a weighting for transmission mode switching. The estimation unit is configured to estimate values of variables in the weighting function expression in each transmission mode according to measurement information on the base station side and report information and scheduling information on the terminal side; the first calculation unit And configured to calculate a value of the weighting function expression in each of the transmission modes; the switching unit is configured to determine that a transmission mode corresponding to a maximum value or a minimum value of the value of the weighting function expression is a switchable transmission Mode, and transfer mode switching.

Preferably, the first calculating unit includes a dividing unit, a scheduling unit, and a second calculating unit, where the dividing unit is configured to divide according to values of variables in the weighting function expression in each estimated transmission mode. a transmission mode set; the scheduling unit is configured to perform a scheduling attempt on the divided transmission mode set Γ ₃ in a scheduling window according to a scheduling pattern, and obtain a value of each variable in the weighting function expression; a calculation unit configured to calculate a value of a weighting function expression in each transmission mode in the transmission mode set Γ ₂ of all the information required to obtain the divided transmission mode switching; and according to the obtained weighting function expression calculating values of the variables of the transmission mode set value of the weighting function expression in various transmission modes Γ _3. Preferably, the scheduling pattern comprises: a scheduling pattern 1: cyclically scheduling each transmission mode in the transmission mode set Γ ₃ in sequence or in reverse order; scheduling pattern 2: sequentially performing the transmission mode in order or in reverse order Each transmission mode in the set Γ ₃ is cyclically scheduled, and the number of consecutive schedulings per round in each transmission mode is greater than one time; scheduling pattern three: odd-numbered rounds sequentially for each of the transmission mode sets Γ ₃ in order or in reverse order transmission scheduling modes, the even-numbered round in the reverse order or the order of each transmission mode in order to schedule ₃ set the transmission mode; scheduling four patterns: the odd-order or reverse gear of the transmission mode set in each Gamma] ₃ The transmission modes are scheduled, and the even rounds schedule each transmission mode in the transmission mode set ₃ in reverse order or in order, and the number of consecutive schedulings per round in each transmission mode is greater than one.

Preferably, each variable in the weighting function expression includes spectral efficiency, block error rate, packet loss rate, and interference to neighboring regions.

Preferably, the device further includes a selecting unit, where the selecting unit is configured to determine that the maximum value or the most d value of the weighting function expression has multiple transmission modes, and determine according to a random selection or a fixed order. A switchable transmission mode is available.

The embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is configured to perform the switching method of the foregoing transmission mode.

In the embodiment of the present invention, the weighting function expression for the transmission mode switching is first determined; and the weighting function expression in each transmission mode is estimated according to the measurement information of the base station side and the reporting information and the scheduling information of the terminal side. a value of the variable; then calculating a value of the weighting function expression in each of the transmission modes, determining that a transmission mode corresponding to a maximum value or a minimum value among the values of the weighting function expression is a switchable transmission mode, and transmitting Mode switching; calculating weights In the process of the value of the expression, the embodiment of the present invention can obtain related information in various transmission modes by dividing the transmission mode set and attempting to schedule, and then determining the switchable transmission mode based on the obtained information and transmitting the information. The mode switching, in this way, makes the switching more accurate and can effectively improve the system throughput. DRAWINGS

1 is a schematic flowchart of an implementation process of a method for switching a transmission mode according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of a specific implementation process of step 103 in FIG.

3 is a schematic structural diagram of a switching device of a transmission mode according to an embodiment of the present invention; and FIG. 4 is a schematic structural diagram of a first computing unit of FIG. detailed description

In the embodiment of the present invention, a weighting function expression for transmission mode switching is first determined, and in each transmission mode, then the transmission mode corresponding to the maximum or minimum value of the weighting function is determined to be a switchable transmission mode and the transmission mode is performed. Switch.

The information for determining the weighting function expression for the transmission mode switching includes Spectrum Effectiveness (SE), Block Error Ratio (BLER), Harq Fail Rate (HFR), and The interference generated by the neighboring cell (NI) or the like; the transmission mode corresponding to the maximum or minimum value of the weighting function is a switchable transmission mode and the transmission mode switching is performed by the base station.

The technical solutions of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments. FIG. 1 is a schematic flowchart of a method for switching a transmission mode according to an embodiment of the present invention. As shown in FIG. 1 , a specific process of the handover method is as follows:

Step 101: Determine a weighting function expression used for transmission mode switching;

Here, the weighting function for transmission mode switching is denoted as SE, BLER, HFR, m, and the weighting function can be expressed by the expression (1): f{SE, BLER, HFR, NI) = W^ SE(l― BLER) + ₂ * e{HFR― TH _X ) + W ₃ * NI where represents the spectral efficiency of the variable, BLER represents the block error rate, HFR represents The variable packet loss rate, N/ indicates the interference generated by the variable to the neighboring cell, and indicates the upper limit of the system tolerant packet loss rate. W _x . W ₂ and T ₃ are the weight coefficient of the variable spectrum efficiency and the weighting coefficient of the variable packet loss rate, respectively. The weight coefficient of the variable to the adjacent zone interference, ε (0 represents the step function, the expression is

Regarding the expression (1), those skilled in the art can determine the expression of the weighting function according to the characteristics of the system, experience, and the like. In actual operation, the weighting function expression can be determined according to a certain parameter of the system, for example: For a system focusing on spectral efficiency, the weight coefficient ^ of the variable spectral efficiency SE can be set much larger than the weight coefficient of other parameters. For a communication system based on the spectrum efficiency maximization criterion, only the weight coefficient of the variable spectral efficiency SE may be reserved, and the weight coefficient of other parameters may be set to 0; for the isolated cell, since the interference to the neighboring region is not required, The weight coefficient ₃ of the interference N/ generated by the variable to the neighboring zone can be set to zero.

Step 102: Estimating values of variables in the weighting function expression in each transmission mode according to measurement information on the base station side and reporting information and scheduling information on the terminal side;

Here, the measurement information of the base station side includes channel estimation information, channel measurement information, and the like, and the reporting information of the terminal side includes a channel quality indicator (CQI), a precoding matrix indication (PMI), and a rank. The indication information of the terminal side includes the number of scheduling, the modulation and coding scheme (MCS) of the scheduling, the transmission mode of the scheduling, and the like.

Specifically, the set of each transmission mode involved in the handover in the system may be denoted as Γ, and the transmission mode set Γ may include, but is not limited to, a transmission mode such as transmit diversity, single-flow beamforming, and dual-stream beamforming; Judging the time, the base station according to the measurement information of the base station side and the terminal side The reporting information and the scheduling information estimate the variable spectral efficiency SE, the variable block error rate BLER, the variable packet loss rate HFR, and the interference N/ generated by the variable to the neighboring region in the weighting function expression in each transmission mode.

Step 103: Calculate a value of the weighting function expression in each transmission mode, determine a transmission mode corresponding to a maximum value or a minimum value among the values of the weighting function expression as a switchable transmission mode, and perform a transmission mode switching. .

Here, the calculating the value of the weighting function expression in each transmission mode is based on the upper limit of the system tolerance packet loss rate determined by step 101, the weight coefficient ^, W ₂ , W ₃ , and in step 102 Estimating the values of the variables in the weighting function expression in each transmission mode, wherein the weight coefficients ^, _2, and ₃ determine the value of the weighting function expression to a certain extent, correspondingly, need to be determined The transmission mode corresponding to the maximum value or the minimum value among the values of the weighting function expression is a switchable transmission mode, and the transmission mode is switched.

Specifically, FIG. 2 is a schematic diagram of a specific implementation process of step 103 in FIG. 1. As shown in FIG. 2, step 103 includes the following steps:

Step 201: According to the value of each variable in the estimated weighting function expression, the transmission mode set 参与 participating in the handover is divided into a transmission mode set 7 that is impossible to be a switchable transmission mode, and all information required for the transmission mode switching is obtained. Transport mode set Γ ₂ and the set of transport modes to be tried Τ ₃ ',

The transmission mode set 7 that is impossible to become the switchable transmission mode refers to all information required for the base station not to obtain the transmission mode switching, and the obtained information does not even obtain the theoretical optimal value; the weighting function corresponding to the transmission mode The value of an expression is usually not a set of transmission modes that are either maximum or minimum;

The transmission mode set Τ ₂ of all the information required to obtain the transmission mode switching refers to a set of transmission modes in which the base station has obtained all the information required for the transmission mode switching;

The transmission mode set ₃ that needs to be tried refers to all the information required for the base station not to obtain the transmission mode switching, but when the unobtained information selects the theoretical optimal value, the weighting corresponding to the transmission mode The value of a function expression may be the set of transmission modes of the maximum or minimum value.

Here, step 201 is to estimate the value of each variable in the weighting function expression in each transmission mode according to step 102, so as to implement the division of the transmission mode set 参与 participating in the handover. Since the value of some variables cannot be accurately estimated, cannot be estimated, or reported inaccurate, the values of these variables are considered to be unknown, and the transmission modes corresponding to the values of the variables are divided into transmission mode sets. in Gamma] _3, therefore, the present invention is set to the transmission mode ₃ to obtain a set of corresponding transmission pattern for each transmission mode Gamma] ₃ by attempting to schedule a variable value, so that the present invention can be switched accurately, and can improve the system throughput.

The case where the estimation cannot be accurately performed includes: when the signal-to-noise ratio (SNR) is low, the channel estimation method and the measurement method on the base station side are invalid; the unpredictable case includes: the pilot structure is different due to different transmission modes. For example, the pilot structure of the BF is different from the pilot structure of the SFBC, and the demodulation performance of the two is inconsistent; the inaccurate reporting includes that the RI and PML CQI information on the terminal side does not satisfy the timeliness. Time.

It can be known from the definitions of the transmission mode sets 2, ₂ and ₃ that the transmission mode in the transmission mode set 7 cannot be a switchable transmission mode, and the switchable transmission mode can only be in the transmission mode set Γ ₂ or Γ ₃ .

Step 202: Try to schedule the transmission mode set ₃ in a scheduling window according to a scheduling pattern, and obtain values of variables in the weighting function expression;

Here, the scheduling window is used to describe several consecutive schedulings; since the attempted scheduling brings system loss, the setting range of the scheduling window is generally set according to the overhead that the system can allow, generally 1% of the switching period of the transmission mode. Up to 10%. The scheduling pattern includes:

Scheduling pattern 1: cyclically scheduling each transmission mode in the transmission mode set Γ ₃ in sequence or in reverse order;

Scheduling pattern two: cyclically scheduling each transmission mode in the transmission mode set Γ ₃ in order or in reverse order, and the number of consecutive schedulings in each transmission mode is greater than one time in each round; Scheduling pattern three: the odd-numbered rounds sequentially schedule each transmission mode in the transmission mode set Γ ₃ in order or in reverse order, and the even-numbered rounds sequentially perform each transmission mode in the transmission mode set Γ ₃ in reverse order or sequentially. Scheduling

Scheduling four patterns: odd or reverse gear in order to set the transmission mode of each transmission mode in the _{3 Γ} scheduling, even rounds in the reverse order or sequentially scheduling the transmission mode in the transmission mode of each set of _{3 Γ,} And each transmission mode is continuously scheduled more than once in each round.

The various transmission modes in the transmission mode set Γ ₃ can be recorded as: Γ ₃ (1) , Τ ₃ (2)... Τ ₃ (η) , correspondingly, the scheduling patterns one, two, three and four Includes the following scheduling patterns:

Scheduling pattern 1: ^Γ 3 ⁽¹⁾ ( ² ).. ("),

2) ;

Scheduling pattern 2: U ¹ ), P)... ² ), ·.., ^Γ3 (")·.. ^Γ3 ("),...;

Scheduling pattern 3: ^Γ ") ^Γ 3("-)... ⁷ ^ ¹ ), ^T i(n) ^Γ 3("- i) . ⁷ ^ ¹ ),...; Scheduling pattern 4: ^Γ ") ... M , ... , P) ... P) , ^(!) ... ^T i ,

Γ ₃ (")·..Γ ₃ ("),..., Γ ₃ (2)·..Γ ₃ (2), Γ ₃ (1) ·..Γ ₃ (1),...; Scheduling pattern 5: ^Τ ^ G) ... ^Τ ^ ^{η Γ} "") ^Γ ""- U" ¹ ), ·..;

Scheduling pattern 6: ^Γ "") ^Γ 3 ("- Ο... ⁷ ^ ¹ ), ^Ο) ^Γ 3( ² ) ... ^Γ 3("), ·.. _;

Scheduling pattern 7: ^Γ 3(!) ... ^( , ^Γ 3( ² ) ... ^Γ 3( ² ) , ... , ^τ Λ ^η , ... ^{τ η} ) , Τ ₃ (η) · Τ ₃ (η),..., Γ ₃ (2) ·..Γ ₃ (2), Γ ₃ (1) ·..Γ ₃ (1),...;

Scheduling pattern 8: ..., ₃ (2) ... ₃ (2), ₃ (1) ... ₃ (1), : Γ ₃ (1) ... Τ ₃ (1) , Γ ₃ (2) ?.. Γ ₃ (2), ...;; The above scheduling pattern can be reasonably changed by those skilled in the art depending on the performance of the system and the like. Generally, in a scheduling window, the base station attempts to schedule various transmission modes in the transmission mode set ₃ according to one or several scheduling patterns described above; the base station obtains each of the weighting function expressions according to the result of the attempted scheduling. The value of the variable. Step 203: Calculate values of weighting function expressions in various transmission modes in the transmission mode set ₂ ; and calculate various types in the transmission mode set ₃ according to the obtained values of the variables in the weighting function expression. The value of the weighting function expression of the transmission mode;

Step 204: Determine that the transmission mode corresponding to the maximum value or the minimum value of the value of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.

Further, if there are multiple maximum transmission modes corresponding to the values of the weighting function expression, the switchable transmission mode is determined according to random selection or in a fixed order.

The above step 202 is a process of processing the transmission mode in the transmission mode set Γ ₃ , and if there is no corresponding transmission mode in the transmission mode set Γ ₃ in the result of the division in step 201, no step is performed.

202. Go directly to step 203.

Embodiment 1:

In this embodiment, it is assumed that the transmission mode involved in the handover is two types: the transmit diversity and the beam assignment. Then, the handover mode of the transmission mode in this embodiment includes the following steps:

Step 301: Determine a weighting function expression used for transmission mode switching;

Here, assuming that the system is a system based on the spectral efficiency maximization criterion, then ^=1, W ₂ =0. W ₃ =0 and T ⁷ ^ =0.01 in the expression (1), then the expression (1) ) deformed to expression (2):

f(SE, BLER, HFR, NI) = SE-(l- BLER) + 0 · e{HFR -0.01) + 0·

f(SE, BLER, HFR, NI) = SE-(l-BLER) ( 2 ); Step 302: Estimating the weighting function expression in each transmission mode according to the measurement information of the base station side and the reporting information and scheduling information of the terminal side The value of each variable in it;

Step 303a: According to the value of each variable in the estimated weighting function expression, the transmission mode set 参与 participating in the handover is divided into a transmission mode set 7 that is impossible to be a switchable transmission mode, and all information required for the transmission mode switching is obtained. Transport mode set ^ and the set of transport modes that need to be tried Here, it is assumed in step 302 can not estimate the value of each variable effective weighting function expression, then, transmit diversity and beamforming are divided transmission mode ₃ set in the set Γ.

Step 303b: Perform an attempt to schedule two transmission modes, namely, transmit diversity and beamforming, and obtain values of variables in the weighted function expression;

Here, assuming that the channel quality of the adjacent scheduling is substantially unchanged, in order to obtain more accurate information, the scheduling pattern that attempts to be scheduled selects the scheduling pattern 1, namely: transmit diversity ₃ (1), beam shaping ₃ (2), Transmit diversity ₃ (1), beamforming ₃ (2)...

For transmit diversity Γ ₃ (1), the values of the variables in the weighting function expression obtained after attempting to schedule are: SE=2.1, BLER=0.1, HFR =0, NI=0;

For beamforming Γ ₃ (2), the values of the variables in the weighting function expression obtained after attempting to schedule are: SE=3, BLER=0.1, HFR =0, NI=1.

Step 303c: Calculate values of weighting function expressions of various transmission modes in the transmission mode set ₃ according to values of variables in the obtained weighting function expression;

According to the expression (2), the value of the weighting function expression of the transmit diversity transmission mode is: f(SE, BLER, HFR, NI) = SE-(l-BLER) = 2.1 x (1-0.1) = 1.89.

According to the expression (2), the value of the weighting function expression of the beamforming transmission mode is: f(SE, BLER, HFR, NI) = SE-(l-BLER) = 3 x (1-0.1) = 2.7.

Step 303d: Determine that the transmission mode corresponding to the maximum value among the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.

In this embodiment, since the value of the weighting function expression of the beamforming is larger than the value of the weighting function expression of the transmitting diversity, the switchable transmission mode is beamforming, and the transmission mode is switched to beamforming.

Embodiment 2:

In this embodiment, it is assumed that the transmission mode involved in the handover has three types: a transmit diversity, a single-flow beamforming, and a dual-flow beamforming. Then, the switching mode of the transmission mode in this embodiment includes the following steps: Step 401: Determine a weighting function expression for transmission mode switching;

Here, assuming that the system is a system requiring a packet loss rate of not higher than 0.001, then let ^=1, FT ₂ = - 100, FT ₃ = 0, and = 0.001 in the expression (1), then the expression (1) ) deformed to expression (3):

f(SE, BLER, HFR, NI) = SE-(l- BLER) -100· e{HFR - 0.001) + 0- f(SE, BLER, HFR, NI) = SE-(l- BLER) -100 · e{HFR― 0.001)

(3)

Step 402: Estimating values of variables in the weighting function expression in each transmission mode according to the measurement information on the base station side and the reporting information and scheduling information on the terminal side;

According to the measurement information of the base station side and the report information and scheduling information of the terminal side, the estimated result is: the variable packet loss rate of the dual stream beamforming transmission mode is 0.01, and the value of the variable block error rate BLER is 0.1. The information is unknown; the variable packet loss rate of the single-flow beamforming transmission mode is 0.0001, and other information is unknown; the information of the estimated transmit diversity transmission mode is unknown;

Step 403a: According to the value of each variable in the estimated weighting function expression, the transmission mode set participating in the handover is divided into a transmission mode set 7 that is impossible to be a switchable transmission mode, and all information required for the transmission mode switching is obtained. Pattern collection ^ and the set of transmission modes T to be tried

Specifically, it is assumed that the theoretical optimal value of the spectral efficiency of the variable is 5, and the theoretical worst value is 0; the theoretical optimal value of the variable N/ to the adjacent region is 0, and the theoretical worst value is 100; The theoretical optimal value of the rate is 0, and the theoretical worst value is 1;

According to the value of each variable in the weighting function expression of each transmission mode estimated in step 402, for the dual-flow beamforming transmission mode, since the variable packet loss rate HFR is 0.01 or more, even if the variable spectral efficiency takes a theoretical optimal value of 5, the variable The interference to the neighboring region N/ takes the theoretical optimal value of 0, and the value of the expression of the weighting function is:

f(SE, BLER, HFR, NI) = 5 x (1 - 0.1) - 100 x 1 + 0 x 0 = - 95.5. For the single-flow beamforming transmission mode, even if the variable spectral efficiency takes the theoretical worst value of 0, the variable's interference to the neighboring region N/takes the theoretical worst value of 100, and the variable errored block rate takes the theoretical worst value of 1; f(SE , BLER, HFR, NI) = 1χ0χ(1—1)—100x0 + 0x100 = 0.

It can be seen from the above calculation that the dual stream beamforming transmission mode is divided into the transmission mode set η, and the single stream beamforming transmission mode and the transmission diversity transmission mode are divided into the transmission mode set Γ ₃ .

Step 403b: Try to adjust the two transmission modes of the transmit diversity and the single-flow beamforming respectively, and obtain the values of the variables in the weighted function expression;

Here, assuming that the channel quality is slowly changed, in order to achieve a simple engineering, the scheduling pattern that attempts to be scheduled selects the scheduling pattern 2, namely: transmit diversity ₃ (1), transmit diversity ₃ (1), single stream beam shaping Γ ₃ (2) , single stream beam shaping Γ ₃ (2)...

For transmit diversity Γ ₃ (1), the values of the variables in the weighting function expression obtained after attempting to schedule are: SE=2, BLER=0.1, HFR =0, NI=1;

For single-flow beamforming Γ ₃ (2), the values of the variables in the weighting function expression obtained after attempting to schedule are: SE=1, BLER=0.1, HFR =0, NI=1;

Step 403c: Calculate values of weighting function expressions of various transmission modes in the transmission mode set ₃ according to values of variables in the obtained weighting function expression;

According to the expression (3), the value of the weighting function expression of the transmit diversity transmission mode is: f(SE, BLER, HFR, NI) = SE-(l-BLER) -100· e{HFR_0.001) = 1.8;

According to the expression (3), the value of the weighting function expression of the single-flow beamforming transmission mode is: f(SE, BLER, HFR, NI) = SE-(l- BLER) -100· e{HFR― 0.001) =0.9;

Step 403d: Determine that the transmission mode corresponding to the maximum value among the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.

In this embodiment, since the value of the weighting function expression of the transmit diversity is larger than the value of the weighting function expression of the single stream beamforming, the switchable transmission mode is transmit diversity, and then the transmission is performed. The mode is switched to transmit diversity.

3 is a schematic structural diagram of a switching apparatus of a transmission mode according to an embodiment of the present invention. As shown in FIG. 3, the switching apparatus of the transmission mode includes a determining unit 31, an estimating unit 32, and a first calculating unit 33 and a switching unit 34. ,

The determining unit 31 is configured to determine a weighting function expression for the transmission mode switching. The estimating unit 32 is configured to estimate the transmission mode according to the measurement information of the base station side and the reporting information and the scheduling information of the terminal side. The values of the variables in the weighting function expression; the variables in the weighting function expression include spectral efficiency, block error rate, packet loss rate, and interference to neighboring regions. The measurement information of the base station side includes: channel estimation information and channel measurement information; the reporting information of the terminal side includes: a channel quality indicator, a precoding matrix indication, and a rank indication; the scheduling information of the terminal side includes: Scheduled modulation and coding schemes and scheduled transmission modes.

The first calculating unit 33 is configured to calculate a value of the weighting function expression in each transmission mode;

The switching unit 34 is configured to determine a maximum value or a maximum value of the value of the weighting function expression, and a transmission mode corresponding to the value is a switchable transmission mode, and perform a transmission mode switching.

Further, the switching device of the transmission mode further includes a selecting unit configured to randomly select or fix a plurality of transmission modes corresponding to the maximum value or the minimum value of the values of the weighting function expression. The sequence determines the switchable transmission mode.

4 is a schematic structural diagram of a first computing unit in FIG. 3. As shown in FIG. 4, the first calculating unit 33 includes a dividing unit 41, a scheduling unit 42, and a second calculating unit 43; wherein the dividing unit 41 And configuring, according to the estimated values of the variables in the weighting function expression in each transmission mode, dividing the transmission mode set 参与 participating in the handover into a transmission mode set that cannot become the switchable transmission mode! a transmission mode set Γ ₂ of all the information required for transmission mode switching and a transmission mode set 需要_{3 to} be tried; The scheduling unit 42 is configured to attempt to schedule the transmission mode set Γ ₃ in a scheduling window according to a scheduling pattern, and obtain values of variables in the weighting function expression;

Scheduling pattern two: cyclically scheduling each transmission mode in the transmission mode set Γ ₃ in order or in reverse order, and the number of consecutive schedulings in each transmission mode is greater than one time in each round;

Scheduling pattern three: the odd-numbered rounds sequentially schedule each transmission mode in the transmission mode set Γ ₃ in order or in reverse order, and the even-numbered rounds sequentially perform each transmission mode in the transmission mode set Γ ₃ in reverse order or sequentially. Scheduling

The second calculating unit 43 is configured to calculate a value of a weighting function expression in various transmission modes in the transmission mode set ₂ of all the information required to obtain the divided transmission mode acquisition; and according to the obtained weighting The values of the variables in the function expression calculate the values of the weighting function expressions of the various transmission modes in the transmission mode set ₃ .

In a specific implementation process, the determining unit, the estimating unit, the first calculating unit, and the switching unit in the switching mode of the transmission mode of the embodiment of the present invention may be implemented by a processor on the base station side, and may also pass through a specific logic circuit. Implementation; for example, in practical applications, the processor can be a Central Processing Unit (CPU), a Micro Processor Unit (MPU), a Digital Signal Processor (DSP), or a field programmable Field Programmable Gate Array (FPGA), etc. Each unit and its subunits in the switching mode of the transmission mode of the embodiment of the present invention may also be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a separate product. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is implemented to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a removable hard disk, a read only memory (ROM), a magnetic disk or an optical disk, and the like, which can store program codes. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores a computer program for performing a switching mode of the transmission mode in the embodiment of the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the patent protection of the present invention. The equivalent structure or equivalent flow transformation made by the description of the present invention and the contents of the drawings may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention. Industrial Applicability In the embodiment of the present invention, a weighting function expression for transmission mode switching is first determined; and then the weighting function expression in each transmission mode is estimated according to the measurement information of the base station side and the reporting information and scheduling information of the terminal side. a value of each of the variables; and calculating a value of the weighting function expression in each of the transmission modes; and finally determining a transmission mode corresponding to a maximum value or a minimum value of the value of the weighting function expression as a switchable transmission mode, And performing transmission mode switching; thus, the embodiment of the present invention can accurately perform handover and can improve the throughput of the system.

Claims

claims

1. A transmission mode switching method, the method includes:

Determine the weighting function expression for transmission mode switching;

Estimate the values of each variable in the weighted function expression under each transmission mode according to the measurement information on the base station side and the reporting information and scheduling information on the terminal side;

Calculate the value of the weighting function expression in each of the transmission modes;

It is determined that the transmission mode corresponding to the maximum value or the minimum value among the values of the weighting function expression is a switchable transmission mode, and the transmission mode is switched.

2. The method according to claim 1, wherein the calculating the value of the weighting function expression in each transmission mode includes:

Divide the transmission mode set according to the values of each variable in the weighted function expression estimated under each transmission mode;

For the divided transmission mode set ₃ that needs to be tried, try scheduling according to the scheduling pattern within a scheduling window, and obtain the values of each variable in the weighted function expression;

Calculate the values of weighted function expressions under various transmission modes in the divided transmission mode set Γ ₂ that has obtained all the information required for transmission mode switching; and calculate based on the obtained values of each variable in the weighted function expression The values of the weighting function expressions of various transmission modes in the transmission mode set ₃ .

3. The method according to claim 2, wherein the scheduling pattern includes:

Scheduling pattern one: cyclically schedule each transmission mode in the transmission mode set Γ ₃ in order or in reverse order;

Scheduling pattern two: perform cyclic scheduling on each transmission mode in the transmission mode set Γ ₃ in order or in reverse order, and the number of consecutive scheduling times for each transmission mode in each round is greater than once;

Scheduling pattern three: odd-numbered rounds in order or in reverse order for each transmission mode set Γ ₃ The transmission mode is scheduled, and the even-numbered rounds are scheduled in reverse order or sequentially for each transmission mode in the transmission mode set Γ ₃ ;

Scheduling pattern four: odd-numbered rounds schedule each transmission mode in the transmission mode set Γ ₃ in order or reverse order, and even-numbered rounds schedule each transmission mode in the transmission mode set Γ ₃ in reverse order or order. And the number of consecutive scheduling times in each round of each transmission mode is greater than once.

4. The method according to claim 1, wherein each variable in the weighted function expression includes spectrum efficiency, block error rate, packet loss rate and interference to neighboring cells.

5. The method according to claim 1, wherein the measurement information on the base station side includes: channel estimation information and channel measurement information;

The reported information on the terminal side includes: channel quality indication, precoding matrix indication and rank indication;

The scheduling information on the terminal side includes: scheduling times, scheduled modulation and coding schemes, and scheduled transmission modes.

6. The method according to any one of claims 1 to 5, wherein the method further includes: when there are multiple transmission modes corresponding to the maximum value or the minimum value among the values of the weighting function expression, randomly select Or determine the switchable transmission mode in a fixed sequence.

7. A transmission mode switching device, the device includes a determination unit, an estimation unit, a first calculation unit and a switching unit, wherein,

The determining unit is configured to determine the weighting function expression for transmission mode switching; the estimating unit is configured to estimate the weighting in each transmission mode based on the measurement information on the base station side and the reporting information and scheduling information on the terminal side. The value of each variable in the function expression;

The first calculation unit is configured to calculate the value of the weighting function expression in each transmission mode;

The switching unit is configured to determine that the transmission mode corresponding to the maximum value or the minimum value among the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.

8. The device according to claim 7, wherein the first computing unit includes a dividing unit, a scheduling unit and a second computing unit, wherein,

The dividing unit is configured to divide the transmission mode set according to the estimated value of each variable in the weighting function expression under each transmission mode;

The scheduling unit is configured to attempt to schedule the divided transmission mode set ₃ that needs to be tried according to the scheduling pattern within a scheduling window, and obtain the values of each variable in the weighted function expression; the second calculation unit is configured as Calculate the values of weighted function expressions under various transmission modes in the divided transmission mode set Γ ₂ that has obtained all the information required for transmission mode switching; and calculate based on the obtained values of each variable in the weighted function expression The values of the weighting function expressions of various transmission modes in the transmission mode set ₃ .

9. The device according to claim 8, wherein the scheduling pattern includes:

Scheduling pattern one: cyclically schedule each transmission mode in the transmission mode set r ₃ in order or in reverse order;

Scheduling pattern two: cyclically schedule each transmission mode in the transmission mode set r ₃ in sequence or in reverse order, and the number of consecutive scheduling times for each transmission mode in each round is greater than once;

Scheduling pattern three: odd-numbered rounds schedule each transmission mode in the transmission mode set r ₃ in sequence or reverse order, and even-numbered rounds schedule each transmission mode in the transmission mode set r ₃ in reverse or sequential order. Scheduling;

Scheduling pattern four: odd-numbered rounds schedule each transmission mode in the transmission mode set r ₃ in sequence or reverse order, and even-numbered rounds schedule each transmission mode in the transmission mode set r ₃ in reverse order or sequence. And the number of consecutive scheduling times in each round of each transmission mode is greater than once.

10. The device according to claim 7, wherein each variable in the weighting function expression includes spectrum efficiency, block error rate, packet loss rate and interference to neighboring cells.

11. The device according to claim 7, wherein the measurement information on the base station side includes: channel estimation information and channel measurement information; The reported information on the terminal side includes: channel quality indication, precoding matrix indication and rank indication;

12. The device according to any one of claims 7 to 11, wherein the device further includes a selection unit;

The selection unit is configured to determine the switchable transmission mode according to random selection or a fixed order when there are multiple transmission modes corresponding to the maximum value or the minimum value among the values of the weighted function expression.

13. A computer storage medium. Computer executable instructions are stored in the computer storage medium. The computer executable instructions are used to execute the transmission mode switching method described in any one of claims 1 to 6.