CN104185206B - A kind of switching method and device of transmission mode - Google Patents
A kind of switching method and device of transmission mode Download PDFInfo
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- CN104185206B CN104185206B CN201310196213.1A CN201310196213A CN104185206B CN 104185206 B CN104185206 B CN 104185206B CN 201310196213 A CN201310196213 A CN 201310196213A CN 104185206 B CN104185206 B CN 104185206B
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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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- H—ELECTRICITY
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Abstract
The invention discloses a kind of switching methods of transmission mode, and the weighting function expression formula of pattern switching is used for transmission including determining；Information and scheduling information are reported according to the metrical information of base station side and terminal side, estimates the value of each variable in the weighting function expression formula under each transmission mode；The value for calculating the weighting function expression formula under each transmission mode determines that maximum value or the corresponding transmission mode of minimum value are changeable transmission mode in the value of the weighting function expression formula, and carries out transmission mode switching.The present invention also discloses a kind of switching devices of transmission mode can accurately switch and improve the handling capacity of system using the present invention.
Description
Technical Field
The present invention relates to Long Term Evolution (LTE) systems, and in particular, to a method and an apparatus for switching transmission modes.
Background
In order to match different application scenarios, multiple transmission modes coexist in the LTE system, and how to adaptively select an optimal transmission mode becomes a key for improving system performance according to the characteristics of the application scenarios. In the prior art, information such as speed, channel correlation, signal-to-noise ratio, spectrum efficiency, etc. is generally used to switch transmission modes, and the acquisition of the information is usually realized by means of base station side estimation or terminal reporting, etc.
For the way of estimating on the base station side, there is a problem that some information cannot be estimated on the base station side, for example: for Beamforming (BF) techniques, the protocol provides for channel estimation using UE-Specific Reference Signals (UE-SRS); for the SFBC (space frequency Block Code) technology, a protocol specifies that a Cell-specific reference signal (CRS) is used for channel estimation, and due to the difference of pilot frequency structures and the possible difference of terminal channel estimation methods, the system performance difference is that a base station side cannot accurately estimate, and thus the accuracy of handover is affected.
For the terminal reporting mode, the following problems exist: firstly, some information protocols do not support reporting; secondly, when the information reported by the terminal is inaccurate, not only the accuracy of the switching is affected, but also the performance of the system is reduced.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for switching transmission modes, which can accurately switch transmission modes and improve system throughput.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for switching transmission modes, which comprises the following steps: determining a weighting function expression for transmission mode switching; estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side; calculating the value of the weighting function expression in each transmission mode; and determining the transmission mode corresponding to the maximum value or the minimum value in the values of the weighting function expression as a switchable transmission mode, and switching the transmission modes.
In the foregoing solution, the calculating the value of the weighting function expression in each transmission mode includes: dividing a transmission mode set according to the estimated value of each variable in the weighting function expression in each transmission mode; for the divided transmission mode set T needing to be tried3Trying to dispatch in a dispatching window according to a dispatching pattern, and obtaining the value of each variable in the weighting function expression; calculating a transmission mode set T of all information required for the divided acquired transmission mode switching2The value of the weighting function expression in each transmission mode; and calculating the transmission mode set T according to the obtained values of the variables in the weighted function expression3The values of the weighted function expressions for the various transmission modes.
In the foregoing solution, the scheduling pattern includes: scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system; scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time; scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Scheduling each transmission mode in the group; scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the sequence is scheduled, the even rounds are in reverse order orSequentially pairing the transmission mode sets T3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
In the above scheme, the variables in the weighting function expression include spectrum efficiency, block error rate, packet loss rate, and interference to the neighboring cell.
In the above solution, the measurement information of the base station side includes: channel estimation information and channel measurement information; the information reported by the terminal side includes: a channel quality indication, a precoding matrix indication and a rank indication; the scheduling information of the terminal side includes: scheduling times, scheduled modulation and coding schemes, and scheduled transmission modes.
In the above scheme, the method further comprises: and when a plurality of transmission modes corresponding to the maximum value or the minimum value in the values of the weighting function expression are available, determining switchable transmission modes according to random selection or a fixed sequence.
The invention also provides a switching device of transmission modes, which comprises a determining unit, an estimating unit, a first calculating unit and a switching unit, wherein the determining unit is used for determining the weighting function expression used for switching the transmission modes; the estimating unit is used for estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side; the first calculating unit is configured to calculate values of the weighting function expressions in the transmission modes; the switching unit is configured to determine that a transmission mode corresponding to a maximum value or a minimum value in the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.
In the foregoing solution, the first calculating unit includes a dividing unit, a scheduling unit, and a second calculating unit, where the dividing unit is configured to divide a transmission mode set according to values of variables in the weighting function expression in estimated transmission modes; the scheduling unit for the need for the divisionAttempted transmission mode set T3Trial scheduling is carried out in a scheduling window according to a scheduling pattern, and the value of each variable in the weighting function expression is obtained; the second calculation unit is used for calculating the divided transmission mode set T of all the information required for obtaining the transmission mode switching2The value of the weighting function expression in each transmission mode; and calculating the transmission mode set T according to the obtained values of the variables in the weighted function expression3The values of the weighted function expressions for the various transmission modes.
In the foregoing solution, the scheduling pattern includes: scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system; scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time; scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Scheduling each transmission mode in the group; scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the set T is scheduled, and the even rounds process the transmission mode set T in a reverse order or sequence3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
In the above scheme, the variables in the weighting function expression include spectrum efficiency, block error rate, packet loss rate, and interference to the neighboring cell.
In the above solution, the measurement information of the base station side includes: channel estimation information and channel measurement information; the information reported by the terminal side includes: a channel quality indication, a precoding matrix indication and a rank indication; the scheduling information of the terminal side includes: scheduling times, scheduled modulation and coding schemes, and scheduled transmission modes.
In the above scheme, the apparatus further comprises a selecting unit; the selection unit is used for determining switchable transmission modes according to random selection or a fixed sequence when a plurality of transmission modes corresponding to the maximum value or the minimum value in the values of the weighting function expression exist.
The invention provides a method and a device for switching transmission modes.A weighting function expression used for switching the transmission modes is determined; estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side; then calculating the values of the weighting function expressions in each transmission mode, determining the transmission mode corresponding to the maximum value or the minimum value in the values of the weighting function expressions as a switchable transmission mode, and switching the transmission modes; in the process of calculating the value of the weighting function expression, the invention can acquire the relevant information under various transmission modes by dividing the transmission mode set and trying a scheduling mode, and further determine the switchable transmission mode based on the acquired information and switch the transmission modes, so that the switching can be more accurate, and the system throughput can be effectively improved.
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Fig. 1 is a schematic flow chart illustrating an implementation of a transmission mode switching method according to the present invention;
FIG. 2 is a schematic diagram of a specific implementation of step 103 in FIG. 1;
FIG. 3 is a schematic diagram of a transmission mode switching apparatus according to the present invention;
fig. 4 is a schematic diagram of a composition structure of the first computing unit in fig. 3.
Detailed Description
The basic idea of the invention is: and determining a weighting function expression for switching the transmission modes, and determining the transmission mode corresponding to the maximum value or the minimum value of the weighting function as a switchable transmission mode and switching the transmission modes in each transmission mode.
The information for determining the weighting function expression for transmission mode switching includes Spectral Efficiency (SE), Block Error rate (BLER), packet loss rate (Harq FailRate, HFR), interference (NI) generated to a neighboring cell, and the like; and the base station determines the transmission mode corresponding to the maximum value or the minimum value of the weighting function to be a switchable transmission mode and performs transmission mode switching.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Fig. 1 is a schematic diagram of an implementation flow of the switching method of the transmission mode of the present invention, and as shown in fig. 1, a specific flow of the switching method is as follows:
step 101: determining a weighting function expression for transmission mode switching;
here, the weighting function for the transmission mode switching is denoted as f (SE, BLER, HFR, NI), and the weighting function can be expressed by expression (1):
f(SE，BLER，HFR，NI)＝W1*SE(1-BLER)+W2*ε(HFR-TH1)+W3*NI (1)
wherein SE represents variable spectrum efficiency, BLER represents variable block error rate, HFR represents variable packet loss rate, and NI represents variableThe amount of interference generated to the adjacent cell is shown in TH1, which represents the upper limit of the packet loss tolerance rate of the system, W1、W2、W3Respectively, weights of variable spectral efficiencyThe weight coefficient of the variable packet loss rate and the weight coefficient of the variable interference to the adjacent region, epsilon (t) represents a step function, and the expression thereofIs of the formulaWhere t represents a random variable.
Regarding 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 practical operation, the weighting function expression may be determined according to a certain parameter of the system, for example: for systems that focus on spectral efficiency, the weighting factor W for the variable spectral efficiency SE may be used1Setting a weight coefficient far larger than other parameters; for the LTE system based on the spectrum efficiency maximization criterion, only the weight coefficient W of the variable spectrum efficiency SE can be reserved1While the weighting coefficients for the other parameters are set to 0; for an island cell, because interference on a neighboring cell does not need to be considered, a weight coefficient W of interference NI generated by a variable on the neighboring cell can be used3Is set to 0.
Step 102: estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side;
here, the measurement information of the base station includes Channel estimation information, Channel measurement information, etc., the reporting information of the terminal includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), etc., and the scheduling information of the terminal includes scheduling times, Modulation and Coding Scheme (MCS) for scheduling, transmission mode for scheduling, etc.
Specifically, a set of transmission modes participating in switching in the system may be denoted as T, and the transmission mode set T may include, but is not limited to, transmission modes such as transmit diversity, single-stream beamforming, and dual-stream beamforming; and at the judgment moment of the switching of the transmission modes, the base station estimates the variable spectrum efficiency SE, the variable block error rate BLER, the variable packet loss rate HFR and the interference NI of the variable to the adjacent cell in the weighted function expression under each transmission mode according to the measurement information at the base station side and the report information and scheduling information at the terminal side.
Step 103: and calculating the values of the weighting function expressions in each transmission mode, determining the transmission mode corresponding to the maximum value or the minimum value in the values of the weighting function expressions as a switchable transmission mode, and switching the transmission modes.
Here, the calculating of the value of the weighting function expression in each transmission mode is based on the upper limit TH of the system packet loss tolerance rate determined in step 1011And the weight coefficient W1、W2、W3And the values of the variables in the weighted function expression in each transmission mode estimated in step 102, wherein the weight coefficient W is1、W2And W3The values of the weighting function expressions are determined to a certain extent, and accordingly, it is necessary to determine that a transmission mode corresponding to a maximum value or a minimum value among the values of the weighting function expressions is a switchable transmission mode, and perform transmission mode switching.
Specifically, fig. 2 is a schematic diagram of a specific implementation flow of step 103 in fig. 1, and as shown in fig. 2, step 103 includes the following steps:
step 201: dividing the transmission mode set T participating in switching into transmission mode sets T unlikely to become switchable transmission modes according to the values of variables in the estimated weighting function expression1Transmission mode set T having acquired all information required for transmission mode switching2And a set of transmission modes T to be tried3；
Wherein the set of transmission modes T that are not likely to become switchable transmission modes1The base station does not obtain all information required by switching the transmission mode, and even if the information which is not obtained selects a theoretical optimal value; a set of transmission modes for which the value of the weighting function expression corresponding to the transmission mode is generally unlikely to be the maximum value or the minimum value;
the transmission mode set T for obtaining all information required for transmission mode switching2Refers to a set of transmission modes for which the base station has obtained all the information required for transmission mode switching;
the set of transmission modes requiring an attemptClosing T3The method refers to a transmission mode set in which the value of a weighting function expression corresponding to a transmission mode may become a maximum value or a minimum value when a base station does not obtain all information required for switching the transmission mode but the obtained information selects a theoretical optimal 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 T participating in switching. Because the values of some variables in step 102 cannot be estimated accurately, cannot be estimated, or reported inaccurately, the values of the variables are considered as unknown, and the transmission modes corresponding to the variable values are further divided into the transmission mode set T3Thus, the present invention is directed to a set of transmission modes T3Acquisition of a set of transmission modes T by attempting scheduling3The invention can switch accurately and improve the throughput of the system.
Wherein the condition that cannot be accurately estimated comprises: when the signal-to-noise ratio (SNR) is low, the channel estimation method and the measurement method at the base station side are invalid; the non-estimable situations include: due to different pilot structures of different transmission modes, for example, the pilot structure of BF is different from the pilot structure of SFBC, etc., the demodulation performance of the BF and the SFBC are inconsistent; and the reporting inaccuracy condition comprises that RI, PMI and CQI information reported by the terminal side do not meet timeliness.
By setting up T transmission modes1、T2And T3By definition, the transmission mode set T1Is not possible to become a switchable transmission mode, which is only possible in the transmission mode set T2Or T3In (1).
Step 202: for the transmission mode set T3Trying to dispatch in a dispatching window according to a dispatching pattern, and obtaining the value of each variable in the weighting function expression;
here, the scheduling window is used to describe a number of schedules in succession; since attempting to schedule causes system loss, the setting range of the scheduling window is generally set according to the overhead that the system can allow, and is generally 1% -10% of the switching period of the transmission mode. The scheduling pattern includes:
scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system;
scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time;
scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Scheduling each transmission mode in the group;
scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the set T is scheduled, and the even rounds process the transmission mode set T in a reverse order or sequence3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
The transmission modes can be set to T3The various transmission modes in (c) are noted as: t is3(1)，T3(2)...T3(n), said scheduling patterns one, two, three and four respectively comprising the following scheduling patterns:
scheduling Pattern ①: T3(1)T3(2)...T3(n)，T3(1)T3(2)...T3(n)，...；
Scheduling Pattern ②: T3(1)...T3(1)，T3(2)...T3(2)，...，T3(n)...T3(n)，...；
Scheduling Pattern ③: T3(n)T3(n-1)...T3(1)，T3(n)T3(n-1)...T3(1)，...；
Scheduling Pattern ④: T3(n)...T3(n)，...，T3(2)...T3(2)，T3(1)...T3(1)，T3(n)...T3(n)，...，T3(2)...T3(2)，T3(1)...T3(1)，...；
Scheduling Pattern ⑤: T3(1)T3(2)...T3(n)，T3(n)T3(n-1)...T3(1)，...；
Scheduling Pattern ⑥: T3(n)T3(n-1)...T3(1)，T3(1)T3(2)...T3(n)，...；
Scheduling Pattern ⑦: T3(1)...T3(1)，T3(2)...T3(2)，...，T3(n)...T3(n)，T3(n)...T3(n)，...，T3(2)...T3(2)，T3(1)...T3(1)，...；
Scheduling Pattern ⑧: T3(N)...T3(n)，...，T3(2)...T3(2)，T3(1)...T3(1)，T3(1)...T3(1)，T3(2)...T3(2)，...，T3(n)...T3(n)，...；
The above scheduling patterns can be reasonably varied by one skilled in the art according to the performance of the system, etc. Typically, the base station sets T transmission modes within a scheduling window according to one or several of the above-mentioned scheduling patterns3Performing trial scheduling in various transmission modes; and the base station acquires the value of each variable in the weighting function expression according to the result of the attempted scheduling.
Step 203: calculating the set of transmission modes T2The value of the weighting function expression in each transmission mode; and according to the obtained weighted function expressionThe value of each variable, calculating the transmission mode set T3Values of the weighted function expressions for the various transmission modes;
step 204: and determining the transmission mode corresponding to the maximum value or the minimum value in the values of the weighting function expression as a switchable transmission mode, and switching the transmission modes.
Further, if there are a plurality of maximum transmission modes corresponding to the values of the weighting function expression, the switchable transmission modes are determined according to random selection or according to a fixed sequence.
The step 202 is to set T transmission modes3The processing procedure of the transmission mode is that if the division result in step 201 is the transmission mode set T3If there is no corresponding transmission mode, step 202 is not performed, and step 203 is directly performed.
The first embodiment is as follows:
in this embodiment, assuming that the transmission modes involved in the handover are two types, namely, transmit diversity and beamforming, the method for switching the transmission modes of this embodiment includes the following steps:
step 301: determining a weighting function expression for transmission mode switching;
here, let W in expression (1) be a system based on the spectral efficiency maximization criterion, assuming that the system is one in which the spectral efficiency is maximized1＝1、W2＝0、W30 and TH1When 0.01, expression (1) is modified to expression (2):
f(SE，BLER，HFR，NI)＝SE·(1-BLER)+0·ε(HFR-0.01)+0·NI
f(SE，BLER，HFR，NI)＝SE·(1-BLER) (2)
step 302: estimating the value of each variable in the weighted function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side;
step 303 a: dividing the transmission mode set T participating in switching into transmission mode sets T unlikely to become switchable transmission modes according to the values of variables in the estimated weighting function expression1Transmission mode set T having acquired all information required for transmission mode switching2And a set of transmission modes T to be tried3；
Here, assuming that step 302 fails to estimate the values of the variables in the effective weight function expression, then both transmit diversity and beamforming are divided into the set of transmission modes T3In the collection.
Step 303 b: respectively trying to dispatch two transmission modes of transmit diversity and beam forming to obtain the value of each variable in the weighting function expression;
here, assuming that the channel quality of the adjacent scheduling is substantially constant, the scheduling pattern of the attempted scheduling selects the scheduling pattern ①, i.e., the transmission diversity T, in order to obtain more accurate information3(1) Beamforming T3(2) Of transmit diversity T3(1) Beamforming T3(2)...
For transmit diversity T3(1) The values of the variables in the weighting function expression obtained after trial scheduling are: SE 2.1, BLER 0.1, HFR 0, NI 0;
for beamforming T3(2) The values of the variables in the weighting function expression obtained after trial scheduling are: SE is 3, BLER is 0.1, HFR is 0, and NI is 1.
Step 303 c: calculating the transmission mode set T according to the values of the variables in the obtained weighted function expression3The values of the weighted function expressions for the various transmission modes;
according to expression (2), the value of the expression of the weighting function for the transmit diversity transmission mode is:
f(SE，BLER，HFR，NI)＝SE·(1-BLER)＝2.1×(1-0.1)＝1.89。
according to expression (2), the value of the weighting function expression of the beamforming transmission mode is:
f(SE，BLER，HFR，NI)＝SE·(1-BLER)＝3×(1-0.1)＝2.7。
step 303 d: and determining the transmission mode corresponding to the maximum value in the values of the weighting function expression as a switchable transmission mode, and switching the transmission modes.
In this embodiment, since the value of the weight function expression of beamforming is greater than the value of the weight function expression of transmit diversity, the switchable transmission mode is beamforming, and further the transmission mode is switched to beamforming.
Example two:
in this embodiment, assuming that the transmission modes involved in the switching include three types, namely transmit diversity, single-stream beamforming and dual-stream beamforming, the method for switching the transmission modes of this embodiment includes the following steps:
step 401: determining a weighting function expression for transmission mode switching;
here, let W in expression (1) be assumed that the system is a system that requires a packet loss rate not higher than 0.0011＝1、W2＝-100、W30 and TH1When 0.001, expression (1) is modified to expression (3):
f(SE，BLER，HFR，NI)＝SE·(1-BLER)-100·ε(HFR-0.001)+0·NI
f(SE，BLER，HFR，NI)＝SE·(1-BLER)-100·ε(HFR-0.001) (3)
step 402: estimating the value of each variable in the weighted function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of 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 estimation result is as follows: the value of variable packet loss rate HFR of the double-current beamforming transmission mode is 0.01, the value of variable block error rate BLER is 0.1, and other information is unknown; the variable packet loss rate HFR of the single-flow beamforming transmission mode is 0.0001, and other information is unknown; estimating that no information of the transmit diversity transmission mode is known;
step 403 a: dividing the transmission mode set participating in switching into a transmission mode set T which cannot become a switchable transmission mode according to the value of each variable in the estimated weighting function expression1Transmission mode set T having acquired all information required for transmission mode switching2And a set of transmission modes T to be tried3；
Specifically, a theoretical optimal value of a variable spectral efficiency SE is assumed to be 5, and a theoretical worst value thereof is assumed to be 0; the theoretical optimal value of the interference NI of the variable on the adjacent cell is 0, and the theoretical worst value is 100; the theoretical optimal value of the variable block error rate BLER is 0, and the theoretical worst value is 1;
according to the values of the variables in the weighted function expressions of the transmission modes estimated in step 402, for the dual-current beamforming transmission mode, since the variable packet loss ratio HFR is 0.01 greater than 0.001, even if the variable spectral efficiency SE takes the theoretical optimal value of 5, the interference NI of the variable to the neighboring cell takes the theoretical optimal value of 0, and the values of the expressions of the weighted functions are as follows:
f(SE，BLER，HFR，NI)＝5×(1-0.1)-100×1+0×0＝-95.5。
for the single-flow beamforming transmission mode, even if the variable spectrum efficiency SE is the theoretical worst value of 0, the interference NI of the variable on the adjacent region is the theoretical worst value of 100, and the variable block error rate BLER is the theoretical worst value of 1;
f(SE，BLER，HFR，NI)＝1×0×(1-1)-100×0+0×100＝0。
from the above calculation, the dual-stream beamforming transmission modes are divided into the transmission mode set T1Medium and single stream beamforming transmission modeThe transmission modes of formula (II) and transmit diversity are divided into a set of transmission modes (T)3In (1).
Step 403 b: trial scheduling is respectively carried out on two transmission modes of transmit diversity and single-stream beamforming, and the value of each variable in the weighting function expression is obtained;
here, assuming that the channel quality is slowly varying, for engineering simplicity, the scheduling pattern of the attempted scheduling selects the scheduling pattern ②, i.e., transmit diversity T3(1) Transmit diversity T3(1) Single stream beamforming T3(2) Single-flow beam forming T3(2)...
For transmit diversity T3(1) The values of the variables in the weighting function expression obtained after trial scheduling are: SE is 2, BLER is 0.1, HFR is 0, NI is 1;
beamforming T for single stream3(2) The values of the variables in the weighting function expression obtained after trial scheduling are: SE is 1, BLER is 0.1, HFR is 0, NI is 1;
step 403 c: calculating the transmission mode set T according to the values of the variables in the obtained weighted function expression3The values of the weighted function expressions for the various transmission modes in (1);
according to expression (3), the value of the expression of the weighting function for the transmit diversity transmission mode is:
f(SE，BLER，HFR，NI)＝SE·(1-BLER)-100·ε(HFR-0.001)＝1.8；
according to expression (3), the value of the weighting function expression of the single stream beamforming transmission mode is:
f(SE，BLER，HFR，NI)＝SE·(1-BLER)-100·ε(HFR-0.001)＝0.9；
step 403 d: and determining the transmission mode corresponding to the maximum value in the values of the weighting function expression as a switchable transmission mode, and switching the transmission modes.
In this embodiment, since the value of the weighting function expression of the transmit diversity is greater than the value of the weighting function expression of the single-stream beamforming, the switchable transmission mode is the transmit diversity, and further the transmission mode is switched to the transmit diversity.
Fig. 3 is a schematic diagram of the composition structure of the switching device of the transmission mode of the present invention, and as shown in fig. 3, the switching device of the transmission mode includes a determining unit 31, an estimating unit 32, a first calculating unit 33, and a switching unit 34; wherein,
the determining unit 31 is configured to determine a weighting function expression for switching transmission modes;
the estimating unit 32 is configured to estimate values of variables in the weighted 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;
variables in the weighted function expression comprise frequency spectrum efficiency, block error rate, packet loss rate and interference generated to adjacent cells.
The measurement information of the base station side comprises: channel estimation information and channel measurement information;
the information reported by the terminal side includes: a channel quality indication, a precoding matrix indication and a rank indication;
the scheduling information of the terminal side includes: scheduling times, scheduled modulation and coding schemes, and scheduled transmission modes.
The first calculating unit 33 is configured to calculate values of the weighting function expressions in the transmission modes;
the switching unit 34 is configured to determine that a transmission mode corresponding to a maximum value or a minimum value in the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.
Further, the apparatus for switching transmission modes further includes a selection unit, where the selection unit is configured to determine a switchable transmission mode according to a random selection or a fixed order when there are multiple transmission modes corresponding to a maximum value or a minimum value in the values of the weighting function expression.
Fig. 4 is a schematic diagram of a composition structure of the first calculating unit in fig. 3, and 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 is configured to divide the transmission mode set T involved in switching into transmission mode sets T that are unlikely to become switchable transmission modes according to the estimated values of the variables in the weighting function expression in each transmission mode1Transmission mode set T having acquired all information required for transmission mode switching2And a set of transmission modes T to be tried3；
The scheduling unit 42 is configured to set T to the transmission mode3Trial scheduling is carried out in a scheduling window according to a scheduling pattern, and the value of each variable in the weighting function expression is obtained;
here, the scheduling window is used to describe a number of schedules in succession; since attempting to schedule causes system loss, the setting range of the scheduling window is generally set according to the overhead that the system can allow, and is generally 1% -10% of the switching period of the transmission mode. The scheduling pattern includes:
scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system;
scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time;
scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Each of the innerScheduling the transmission modes;
scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the set T is scheduled, and the even rounds process the transmission mode set T in a reverse order or sequence3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
The second calculating unit 43 is used for calculating the divided transmission mode set T of all the information required for obtaining the transmission mode switching2The value of the weighting function expression in each transmission mode; and calculating the transmission mode set T according to the obtained values of the variables in the weighted function expression3The values of the weighted function expressions for the various transmission modes.
The integrated unit of the present invention may also be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (12)
1. A method for switching transmission modes, the method comprising:
determining a weighting function expression for transmission mode switching;
estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side;
calculating the value of the weighting function expression in each transmission mode;
and determining the transmission mode corresponding to the maximum value or the minimum value in the values of the weighting function expression as a switchable transmission mode, and switching the transmission modes.
2. The method of claim 1, wherein the calculating the value of the weighting function expression in each transmission mode comprises:
dividing a transmission mode set according to the estimated value of each variable in the weighting function expression in each transmission mode;
for the divided transmission mode set T needing to be tried3Trying to dispatch in a dispatching window according to a dispatching pattern, and obtaining the value of each variable in the weighting function expression;
calculating a transmission mode set T of all information required for the divided acquired transmission mode switching2The value of the weighting function expression in each transmission mode; and calculating the transmission mode set T according to the obtained values of the variables in the weighted function expression3The values of the weighted function expressions for the various transmission modes.
3. The method of claim 2, wherein the scheduling pattern comprises:
scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system;
scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time;
scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Scheduling each transmission mode in the group;
scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the sequence is scheduled, and the even rounds are performed in reverse order or sequenceSet of transmission modes T3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
4. The method of claim 1, wherein the variables in the weighted function expression include spectral efficiency, block error rate, packet loss rate, and interference to neighboring cells.
5. The method of claim 1, wherein the measurement information of the base station side comprises: channel estimation information and channel measurement information;
the information reported by the terminal side includes: a channel quality indication, a precoding matrix indication and a rank indication;
the scheduling information of 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, further comprising: and when a plurality of transmission modes corresponding to the maximum value or the minimum value in the values of the weighting function expression are available, determining switchable transmission modes according to random selection or a fixed sequence.
7. An apparatus for switching transmission modes, the apparatus comprising a determining unit, an estimating unit, a first calculating unit, and a switching unit, wherein,
the determining unit is used for determining a weighting function expression for switching the transmission mode;
the estimating unit is used for estimating the value of each variable in the weighting function expression in each transmission mode according to the measurement information of the base station side and the report information and scheduling information of the terminal side;
the first calculating unit is configured to calculate values of the weighting function expressions in the transmission modes;
the switching unit is configured to determine that a transmission mode corresponding to a maximum value or a minimum value in the values of the weighting function expression is a switchable transmission mode, and perform transmission mode switching.
8. The apparatus of claim 7, wherein the first computing unit comprises a partitioning unit, a scheduling unit, and a second computing unit, wherein,
the dividing unit is used for dividing a transmission mode set according to the estimated value of each variable in the weighting function expression under each transmission mode;
the scheduling unit is used for setting the divided transmission modes T needing to be tried3Trial scheduling is carried out in a scheduling window according to a scheduling pattern, and the value of each variable in the weighting function expression is obtained;
the second calculation unit is used for calculating the divided transmission mode set T of all the information required for obtaining the transmission mode switching2The value of the weighting function expression in each transmission mode; and calculating the transmission mode set T according to the obtained values of the variables in the weighted function expression3The values of the weighted function expressions for the various transmission modes.
9. The apparatus of claim 8, wherein the scheduling pattern comprises:
scheduling pattern one: sequentially aligning the transmission mode set T in sequence or reverse sequence3Performing cyclic scheduling for each transmission mode in the system;
scheduling pattern two: sequentially aligning the transmission mode set T in sequence or reverse sequence3Each transmission mode in the system carries out cyclic scheduling, and the continuous scheduling times in each round of each transmission mode are more than one time;
scheduling pattern three: odd-numbered rounds of sequentially and reversely aligning the transmission mode set T3Each transmission mode in the transmission mode set is scheduled, and the transmission mode set T is sequentially processed by even rounds according to the reverse order or the sequence3Scheduling each transmission mode in the group;
scheduling pattern four: odd-numbered rounds of sequentially or reversely combining the transmission mode set T3Each transmission mode in the set T is scheduled, and the even rounds process the transmission mode set T in a reverse order or sequence3And scheduling in each transmission mode, wherein the continuous scheduling times in each round of each transmission mode are more than one time.
10. The apparatus of claim 7, wherein the variables in the expression of the weighting function include spectral efficiency, block error rate, packet loss rate, and interference to neighboring cells.
11. The apparatus of claim 7, wherein the measurement information of the base station side comprises: channel estimation information and channel measurement information;
the information reported by the terminal side includes: a channel quality indication, a precoding matrix indication and a rank indication;
the scheduling information of the terminal side includes: scheduling times, scheduled modulation and coding schemes, and scheduled transmission modes.
12. The device according to any one of claims 7 to 11, characterized in that it further comprises a selection unit;
the selection unit is used for determining switchable transmission modes according to random selection or a fixed sequence when a plurality of transmission modes corresponding to the maximum value or the minimum value in the values of the weighting function expression exist.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310196213.1A CN104185206B (en) | 2013-05-23 | 2013-05-23 | A kind of switching method and device of transmission mode |
| JP2016513203A JP6073026B2 (en) | 2013-05-23 | 2013-12-30 | Transmission mode switching method and apparatus, and computer storage medium |
| RU2015148748A RU2615998C1 (en) | 2013-05-23 | 2013-12-30 | Method and device for communication mode switching and computer data media |
| PCT/CN2013/090928 WO2014187140A1 (en) | 2013-05-23 | 2013-12-30 | Method and apparatus for switching transmission mode, and computer storage medium |
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| CN201310196213.1A CN104185206B (en) | 2013-05-23 | 2013-05-23 | A kind of switching method and device of transmission mode |
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| CN104185206B true CN104185206B (en) | 2019-02-12 |
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| CN113938936A (en) * | 2020-06-29 | 2022-01-14 | 中兴通讯股份有限公司 | Communication management method, communication management device, network equipment and storage medium |
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| CN102724726A (en) * | 2012-06-12 | 2012-10-10 | 大唐移动通信设备有限公司 | Method and device for switching multiple input multiple output (MIMO) mode in transmission mode (TM8) in long-term evolution (LTE) system |
| CN102970119A (en) * | 2012-11-09 | 2013-03-13 | 大唐移动通信设备有限公司 | Method for switching first transmission mode into second transmission mode |
| CN103095397A (en) * | 2011-11-04 | 2013-05-08 | 华为技术有限公司 | Transmission mode switching method and device and system |
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| KR100713403B1 (en) * | 2003-09-30 | 2007-05-04 | 삼성전자주식회사 | Apparatus and method for controlling transmission scheme according to channel state in a communication system |
| JP4276677B2 (en) * | 2004-06-14 | 2009-06-10 | パナソニック株式会社 | Wireless communication device |
| CN101557559B (en) * | 2008-04-11 | 2011-09-21 | 中兴通讯股份有限公司 | Method for switching transmission modes of multimedia broadcasting service and multicasting service |
| JP2010056615A (en) * | 2008-08-26 | 2010-03-11 | Panasonic Electric Works Co Ltd | Load control system |
| CN102244564B (en) * | 2010-05-11 | 2014-12-10 | 中兴通讯股份有限公司 | Downlink transmission method and base station of MIMO (Multiple Input Multiple Output) system |
| IN2010DE02109A (en) * | 2010-09-03 | 2015-08-14 | Motorola Mobility Inc | |
| JP5651005B2 (en) * | 2010-12-22 | 2015-01-07 | 京セラ株式会社 | Base station, communication terminal and communication system |
| CN103001732B (en) * | 2011-09-19 | 2017-04-05 | 北京邮电大学 | Transmission mode selection method, device and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095397A (en) * | 2011-11-04 | 2013-05-08 | 华为技术有限公司 | Transmission mode switching method and device and system |
| CN102724726A (en) * | 2012-06-12 | 2012-10-10 | 大唐移动通信设备有限公司 | Method and device for switching multiple input multiple output (MIMO) mode in transmission mode (TM8) in long-term evolution (LTE) system |
| CN102970119A (en) * | 2012-11-09 | 2013-03-13 | 大唐移动通信设备有限公司 | Method for switching first transmission mode into second transmission mode |
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| WO2014187140A1 (en) | 2014-11-27 |
| JP2016524381A (en) | 2016-08-12 |
| CN104185206A (en) | 2014-12-03 |
| RU2615998C1 (en) | 2017-04-12 |
| JP6073026B2 (en) | 2017-02-01 |
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