WO2012139398A1

WO2012139398A1 - Method and device for adaptive transmission mode scheduling

Info

Publication number: WO2012139398A1
Application number: PCT/CN2011/083889
Authority: WO
Inventors: 王希维; 姚春峰; 张娟
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-12
Filing date: 2011-12-13
Publication date: 2012-10-18
Also published as: CN102739342A

Abstract

Disclosed are a method and device for adaptive transmission mode scheduling. The method comprises: estimating the spectral efficiency of two transmission modes periodically according to a channel quality indicator (CQI) reported by a terminal and an outer loop adjustment parameter △MCS maintained by a base station; correcting the spectral efficiency when a preset condition is satisfied; and selecting the transmission mode with the higher spectral efficiency as the transmission mode for the current scheduling. In the present invention, the transmission mode is selected based on the spectral efficiency, and the MIMO transmission mode with higher spectral efficiency may be selected, so the system throughput is effectively improved, and the problem of the incorrectly selected transmission mode and the poor system throughput performance caused by the incorrect rank indicator (RI) reported by a terminal in the downlink transmission mode 3 of a dual-antenna LTE system is solved.

Description

Method and device for adaptive transmission mode scheduling

The present invention relates to the field of mobile communications, and in particular, to a method and apparatus for adaptive transmission mode scheduling. Background technique

LTE (Long Term Evolution) is a 3GPP (3rd Generation Partnership Project) under the trend of "mobile communication broadband", in order to counter the market warfare of mobile broadband wireless access technologies such as WiMAX (World Interoperability for Microwave Access). Based on the technical reserves of the Super 3G (B3G) research for more than a decade, the "quasi 4G" technology was developed. LTE uses frequency division multiple access (OFDM) in the air interface, which is OFDM (Orthogonal Frequency Division Multiplexing), which replaces the long-term CDMA (Code-Division Multiple Access) technology and uses a large number of multiple input and multiple outputs. (MIMO, Multiple Input Multiple Output) technology and adaptive technology improve data rate and system performance, so it will become the core technology of future cellular mobile communication systems and wireless broadband access systems.

The principle of transmission mode scheduling is to change the transmission mode according to changes in channel conditions. For the downlink transmission mode 3 of the two-antenna LTE system, the MIMO technology of the transmission diversity mode and the spatial multiplexing mode may be used for transmission, where the RI ( Rank Indication) is 1 corresponding to the transmit diversity transmission mode, and the RI is 2 o'clock corresponds to the spatial multiplexing transmission mode. Transmit diversity is better than spatial multiplexing, while spatial multiplexing can achieve higher peak rates relative to transmit diversity. Therefore, two transport modes need to be selected based on actual channel conditions.

In the related art, an idea is put forward, that is, in a statistical window, the number of times of reporting RI=1 and the number of times of reporting of RI=2 are selected, and the RI with a higher number of times of reporting is selected as the RL for delivery. Count the number of reports of each RI in the window, and select the RI with more reported times. Depending on the reporting of the terminal, if the RI reported by the terminal is not accurate enough, the algorithm will select the wrong transmission mode. Summary of the invention

The main object of the present invention is to provide a method and an apparatus for adaptive transmission mode scheduling, which can solve the problem that the transmission mode selection error is caused by the inaccurate RI reported by the terminal in the downlink transmission mode 3 of the two-antenna LTE system, and improve the system throughput performance. .

The embodiment of the invention provides a method for adaptive transmission mode scheduling, which includes:

The spectrum efficiency of the two transmission modes is estimated periodically according to the channel quality indicator CQI reported by the terminal and the outer loop adjustment parameter s maintained by the base station;

Correct the spectral efficiency when the preset conditions are met;

The transmission mode with high spectral efficiency is selected as the transmission mode of the current scheduling.

Preferably, the spectrum efficiency of the two transmission modes is predicted according to the channel quality indicator CQI reported by the terminal and the outer loop adjustment parameter maintained by the base station, including:

Obtain CQI and Δ Ο^ for two transmission modes;

Calculating two modes of modulation coding scheme MCS according to the CQI and ΔΛΛ;

According to the MCS of the two modes, the mapping table of the preset MCS and the spectrum efficiency is searched, and the spectral efficiency of the two modes is obtained.

Preferably, the obtaining the CQI of the two transmission modes comprises:

Determining a transmission mode corresponding to the CQI reported by the terminal;

Calculating a CQI of another transmission mode according to the CQI reported by the terminal;

The CQIs of the two transmission modes are respectively filtered to obtain CQIs of the final two transmission modes.

Preferably, the obtaining Δ of the two transmission modes is (^ is:

S is updated by adaptive modulation coding AMC update CS and/or when a preset condition is met. Preferably, the method for the adaptive transmission mode scheduling further includes:

When the spectral efficiency of the two transmission modes is the same, the transmission mode of the last scheduling moment is selected as the transmission mode of the scheduling;

When the current scheduling is the first scheduling, the transmit diversity mode is selected as the transmission mode.

An embodiment of the present invention further provides an apparatus for adaptive transmission mode scheduling, including: an estimation module, a correction module, and a selection module;

The estimation module is configured to adjust a parameter Δ according to a channel quality indicator CQI reported by the terminal and an outer loop maintained by the base station, and periodically estimate the spectrum efficiency of the two transmission modes;

The correction module is configured to correct the spectral efficiency when the preset condition is met; and the selecting module is configured to select the transmission mode with a large spectral efficiency as the transmission mode of the current scheduling.

Preferably, the estimating module comprises: an obtaining unit, a calculating unit and a searching unit; wherein the acquiring unit is configured to acquire CQI and Δ of two transmission modes (^;

The calculating unit is configured to calculate the MCS of the two modes according to the CQI and the ACS, and the searching unit is configured to search, according to the MCS of the two modes, a mapping table of the preset MCS and the spectrum efficiency, The spectral efficiency of the two modes is obtained.

Preferably, the acquiring unit includes: a determining subunit, a converting subunit, and a filtering subunit; wherein

The determining subunit is configured to determine a transmission mode corresponding to the CQI reported by the terminal; the conversion subunit is configured to obtain a CQI of another transmission mode according to the CQI reported by the terminal;

The filtering subunit is configured to filter the CQIs of the two transmission modes respectively to obtain CQIs of the final two transmission modes.

Preferably, the acquiring unit further includes:

Update the subunit, set to update Δ Ο^ and/or satisfy the preamble by adaptive modulation coding AMC Update the ^MCS when the condition is set.

Preferably, the selection module is further configured to:

The method and device for adaptive transmission mode scheduling proposed by the embodiment of the present invention can select a transmission mode based on spectral efficiency, can select a MIMO transmission mode with higher spectrum efficiency, effectively improve system throughput, and solve the downlink transmission of the two-antenna LTE system. In mode 3, due to the inaccurate RI reported by the terminal, the error transmission mode is selected, and the system throughput performance is poor. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic flowchart of an embodiment of an adaptive transmission mode scheduling method according to the present invention; FIG. 2 is a schematic flowchart of an estimation step in an embodiment of an adaptive transmission mode scheduling method according to the present invention;

3 is a schematic diagram of a process for acquiring CQI in an embodiment of an adaptive transmission mode scheduling method according to the present invention;

4 is a schematic flowchart of an update in an embodiment of an adaptive transmission mode scheduling method according to the present invention;

FIG. 5 is a schematic flowchart of still another embodiment of an apparatus for adaptive transmission mode scheduling according to the present invention; FIG. 6 is a structural schematic diagram of an apparatus for adaptive transmission mode scheduling according to the present invention; FIG. A schematic structural diagram of an estimation module in an embodiment of the apparatus;

FIG. 8 is a schematic structural diagram of an acquiring unit in an embodiment of an apparatus for adaptive transmission mode scheduling according to the present invention; FIG.

FIG. 9 is another schematic structural diagram of an acquiring unit in an embodiment of an apparatus for adaptive transmission mode scheduling according to the present invention. detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1, an embodiment of an adaptive transmission mode scheduling method according to the present invention is provided. The method includes:

Step S10: Estimating the spectrum efficiency of the two transmission modes according to the channel quality indicator CQI reported by the terminal and the outer loop adjustment parameter maintained by the base station;

Here, after receiving the CQI reported by the terminal, the MCS initial values of the two transmission modes R1 and R2 are respectively obtained by the CQI reported by the terminal; and the outer loop adjustment parameter Δ <^ maintained by the base station is used to obtain the spectrum of the transmission modes R1 and R2. effectiveness.

Step S11: When the preset condition is met, the spectrum efficiency is corrected, and the spectrum efficiency transmission mode is selected as the transmission mode of the current scheduling.

Here, the correction of the spectral efficiency is generally: updating Δ Ο?, calculating the MCS of the two modes according to the CQI and the updated Δ (^, and then searching for the preset MCS and the spectral efficiency mapping table, the spectral efficiency Make corrections to get more accurate spectral efficiency.

According to the estimated spectral efficiency of the two transmission modes, a spectrally efficient transmission mode is selected as the transmission mode of the delivered data.

In this embodiment, the selection of the transmission mode based on the spectrum efficiency may select a MIMO transmission mode with higher spectral efficiency, effectively improve the system throughput, and solve the problem of selecting the wrong transmission mode due to the inaccurate RI reported by the terminal, and the system throughput performance. Poor question.

Referring to FIG. 2, in an embodiment, step S10 may further include:

Step S101: Obtain CQI and ΔΛΛ of two transmission modes;

Step S102: Calculate two modes of MCS according to the CQI and Δ Ο^;

According to the CQI of the two transmission modes obtained in step S101, and the mapping table of the initial values of CQI and MCS (the mapping relationship is preset, the set criterion may be: when an MCS corresponds When the spectral efficiency is closest to the spectral efficiency corresponding to the reported CQI, the MCS is set to the initial MCS value corresponding to the CQI, and the MCS initial values of the two transmission modes are respectively obtained (denoted as ^MCS ^), and then the two transmissions are utilized. The outer loop adjustment parameter Δ (^ of the mode is corrected to obtain the final MCS of the two transmission modes. The correction process is carried out according to the following formula:

MCS = MCS _init + AMCS

Step S103: Search for a preset mapping table between the MCS and the spectrum efficiency according to the MCS of the two modes, and obtain spectrum efficiencies of the two modes.

According to the final MCS of the two transmission modes obtained, the spectral efficiency of the two transmission modes is obtained by a preset mapping table of MCS and spectrum efficiency (according to simulation).

In this embodiment, according to the CQI reported by the terminal and the outer loop adjustment parameter Δ maintained by the base station, the spectrum efficiency of each transmission mode is obtained, and the transmission mode decision using the uplink channel parameter in the FDD mode is avoided, and the result is inaccurate.

Referring to FIG. 3, in the foregoing embodiment, step S101 may further include:

Step S1011: Determine a transmission mode corresponding to the CQI reported by the terminal;

According to whether there is broadband CQI reporting at this scheduling time, different processing is performed. If there is a wideband CQI report, and the RI corresponding to the CQI is determined, the CQI corresponding to the RI is the CQI reported by the terminal. If there is no broadband CQI reporting, and this scheduling is not the first scheduling, the two transmission modes use the CQI used in the previous scheduling moment. The initial value of the CQI of the two transmission modes is a configurable preset value (experience value, preferably 0). If there is no broadband CQI reporting, and this scheduling is the first scheduling, the transmission mode is determined to be transmit diversity, that is, RI=1, and the process ends.

Step S1012: Calculating CQI of another transmission mode according to the CQI reported by the terminal; CQI of another transmission mode is obtained by converting the reported CQI, and the conversion method of the CQI may be:

Passing the CQI through a mapping table of CQI and signal to interference plus noise ratio SINR (this table is obtained by simulation) to obtain a corresponding SINR, and if the CQI corresponds to RI=1, the obtained SINR is obtained. Subtracting a preset value (usually an empirical value), and then passing the corrected SINR through a mapping table of CQI and SINR to obtain a CQI corresponding to RI=2; if the CRI corresponding to RI=2, the obtained SINR A preset value ^MM? 2 (usually an empirical value) is added, and then the corrected SINR is passed through a mapping table of CQI and SINR to obtain a CQI corresponding to RI=1.

Step S1013: Filter CQIs of the two transmission modes to obtain CQIs of the final two transmission modes.

After obtaining the CQI of the two transmission modes, respectively filtering the respective CQIs, and the filtering processing method of the CQI is:

CQI _cur = a CQI _last + (l- a) CQI _cur where, represents the CQI obtained by reporting or discounting at this scheduling time. The CQI obtained after the time-filtering process of reporting the wideband CQI on the previous terminal, "represents the filter coefficient, and the value range is " ^€ ( ^ι ). If the CQI reporting time is reported for the first time, the filter coefficient is "=0.

In this embodiment, the CQI of the two transmission modes is obtained by converting and filtering the CQI reported by the terminal, and the CQI data of the two transmission modes is further refined.

Referring to FIG. 4, in the foregoing embodiment, step S101 may further include:

Step S1014: Update the AMC by adaptive modulation coding and/or when the preset condition is met.

Step S1014 may be performed simultaneously with steps S1011, S1012, and S1013, or before or after any of steps S1011, S1012, and S1013, the maintenance of the outer loop adjustment parameter includes an outer loop parameter Δ obtained by AMC (^ and satisfies Adjustment of Δ (^) when the condition is preset.

Specifically, obtaining the outer loop parameter by AMC can be a plurality of methods commonly used. The following is a common method: By counting the BLER within a preset window length (usually the empirical value), if the BLER is above the preset threshold of ⁷ (usually the empirical value, 10% or other empirical value may be used) , then adjust Δ (^ downward by one step ^<^ (usually empirical value, may take 1), if BLER is lower than the preset threshold of ⁷ (usually empirical value, ^T K r2 ^^ Th _{bl£ R2} _{≤Th blerl )?} A CS is adjusted upward by a step size ^ ₂ (usually an empirical value, which can take 1), if the BLER is satisfied

^{When T} r2 ^{≤ BLER} ≤ ^T Kerl , the AMCS remains unchanged.

Specifically, the method for adjusting Δ (^ when the preset condition is met may be as follows: counting the number of times of using the two transmission modes and the mean of the spectral efficiency in a preset window length (usually an empirical value), If the number of times RI=1 is used is lower than a preset threshold (usually the empirical value, 5% of the window length can be taken), and the average spectral efficiency of RI=2 in the window length is less than the maximum spectral efficiency that RI=1 can support. , then correct the RI=1, the correction is carried out according to the following formula:

AMCS = AMCS + Amcs _ril

Otherwise, if the number of times RI=2 is used is lower than a preset threshold (usually the empirical value, 5% of the window length may be taken), and the average spectral efficiency of RI=1 in the window length is greater than that supported by RI=1. Small spectral efficiency (usually empirical value, which can be taken as the spectral efficiency corresponding to RI=1 when MCS=5), then the S of RI=2 is corrected, and the correction is performed according to the following formula:

AMCS = AMCS + Amcs _ri2

Among them, Am" _ril and Δ"7"'·' ₂ are preset step values, which are integers greater than zero. It is preferable to use L. In this embodiment, the outer loop adjustment parameter ^ CS can be obtained through AMC or the preset condition is satisfied. The A CS is adjusted to correct the spectral efficiency of the transmission mode corresponding to the A CS, and avoid the spectral efficiency estimation error problem caused by Δ (^ inaccuracy).

Referring to FIG. 5, another embodiment of a method for adaptive transmission mode scheduling according to the present invention is provided. In the foregoing embodiment, the method may further include:

Step S12: When the spectrum efficiency of the two transmission modes is the same, the transmission mode of the last scheduling moment is selected as the transmission mode of the scheduling; if the scheduling is the first scheduling, the transmission diversity mode is selected as the transmission mode.

If the spectrum efficiency of the two transmission modes is the same, the transmission mode used in the previous scheduling time is selected as the transmission mode of the current data transmission; if the current scheduling is the first scheduling, the transmission is selected. In this embodiment, a selection is made for a transmission mode when the spectral efficiencies of the two transmission modes are the same. Referring to FIG. 6, an embodiment of an apparatus for adaptive transmission mode scheduling according to the present invention includes: an estimation module 10 configured to adjust a parameter Δ (^ according to a channel quality indicator CQI reported by a terminal and an outer ring maintained by a base station. Timing estimation of the spectral efficiency of the two transmission modes;

The correction module 30 is configured to correct the spectral efficiency when the preset condition is met; and the selection module 20 is configured to select the transmission mode with the spectral efficiency to be the transmission mode of the current scheduling.

In this embodiment, the apparatus for adaptive transmission mode scheduling may be a base station, or may be a separate device built in or external to the base station.

The apparatus for adaptive transmission mode scheduling receives the CQI reported by the terminal, and the estimation module 10 obtains the initial MCS values of the two transmission modes R1 and R2 respectively by using the CQI reported by the terminal; and then uses the outer ring adjustment parameters maintained by the base station to obtain the transmission mode. The spectral efficiency of R1 and R2.

The selection module 20 selects a spectrally efficient transmission mode as the transmission mode of the delivered data based on the estimated spectral efficiency of the two transmission modes.

In this embodiment, the selection of the transmission mode based on the spectrum efficiency can select the ΜΙΜΟ transmission mode with higher spectral efficiency, effectively improve the system throughput, and solve the problem of selecting the erroneous transmission mode due to the inaccurate RI reported by the terminal, and the system throughput performance. Poor question.

Referring to Figure 7, in an embodiment, the estimation module 10 can include:

The obtaining unit 11 is set to acquire the CQI sum of the two transmission modes;

The calculating unit 12 is configured to calculate the MCS according to the CQI and the two modes; the searching unit 13 is configured to search the preset MCS and the spectrum efficiency mapping table according to the MCS of the two modes, and obtain the two modes. Spectral efficiency.

According to the CQI of the two transmission modes obtained by the obtaining unit 11, the calculating unit 12 refers to the mapping table of the initial values of the CQI and the MCS (the mapping relationship is preset, and the set criterion is: When the spectral efficiency corresponding to the MCS is closest to the spectral efficiency corresponding to the reported CQI, the MCS is set to the initial MCS value corresponding to the CQI, and the MCS initial values of the two transmission modes are respectively obtained (denoted as ^MC «, and then the calculation unit 12 The outer loop adjustment parameter S of the two transmission modes is used to correct the final MCS of the two transmission modes. The correction process of the calculation unit 12 is performed according to the following formula:

MCS = MCS _init + AMCS

According to the final MCS of the two transmission modes obtained, the search unit 13 obtains the spectral efficiencies of the two transmission modes by using a preset mapping table of MCS and spectral efficiency (according to the simulation).

In this embodiment, the spectrum efficiency of each transmission mode is obtained according to the CQI reported by the terminal and the outer loop adjustment parameter maintained by the base station, and the transmission mode decision using the uplink channel parameter in the FDD mode is avoided, and the result is inaccurate.

Referring to FIG. 8, in the above embodiment, the obtaining unit 11 may include:

The determining subunit 111 is configured to determine a transmission mode corresponding to the CQI reported by the terminal; the conversion subunit 112 is configured to obtain a CQI of another transmission mode according to the CQI reported by the terminal;

The filtering sub-unit 113 is configured to separately filter the CQIs of the two transmission modes to obtain the CQIs of the final two transmission modes.

According to whether there is broadband CQI reporting at this scheduling time, different processing is performed. If there is a wideband CQI report, the determining subunit 111 determines the RI corresponding to the CQI, and the CQI corresponding to the RI is the CQI reported by the terminal. If there is no broadband CQI reporting, and this scheduling is not the first scheduling, the two transmission modes use the CQI used in the previous scheduling moment. The initial value of the CQI of the two transmission modes is a configurable preset value (experience value, preferably 0). If there is no broadband CQI reporting, and this scheduling is the first scheduling, the transmission mode is determined to be transmit diversity, that is, RI=1.

The CQI of another transmission mode is converted by the conversion sub-unit 112 to the reported CQI. To, the conversion method of CQI can be:

The CQI is obtained by using a mapping table of CQI and SINR (the table is obtained by simulation) to obtain a corresponding SINR. If the CQI corresponds to RI=1, the obtained SINR is subtracted by a preset value ^ASINR ^ (usually an empirical value). Then, the corrected SINR is passed through a mapping table of CQI and SINR to obtain a CQI corresponding to RI=2; if the RI=2 corresponding to the CQI, the obtained SINR is added with a preset value ^MM? 2 (usually It is an empirical value), and then the corrected SINR is passed through a mapping table of CQI and SINR to obtain a CQI corresponding to RI=1.

After obtaining the CQI of the two transmission modes, the filtering sub-unit 113 respectively filters the respective CQIs, and the filtering processing method of the CQI is:

CQI _cur = a CQI _last + (l- a) CQI _cur

The CQI obtained by reporting or converting the current time of the scheduling time indicates the CQI obtained by the time-filtering process of reporting the broadband CQI of the previous terminal, "representing the filter coefficient, and the value range is " ^e ( ^Q ^. If the CQI reporting time is first) The second report, then the filter coefficient " = 0.

Referring to FIG. 9, in the above embodiment, the obtaining unit 11 may further include:

Update sub-unit 114, set to update the CS when the AMC is updated by adaptive modulation and/or when the preset condition is met.

Update subunit 114 The outer loop parameters obtained by the AMC and the adjustments made when the preset conditions are met.

Specifically, the update sub-unit 114 obtains the outer loop parameter through the AMC may be a plurality of methods commonly used. The following is a common method: By counting the BLER within a preset window length (usually the empirical value), if the BLER is above a preset threshold (usually an empirical value, 10% or other empirical value), Then Δ (^ is adjusted downward by one step ^<^ (usually empirical value, can take 1), if BLER is lower than the preset threshold of ⁷ (usually empirical value, ⁷⁷¹ ^ needs to be satisfied _{Lh bler2} < lh _blerl ), then adjust A CS up by a step size ^ ₂ (usually experience value, which can take 1). If ΒΙΈ ί full BLER _≤ Th _blerl , then Δ (^ remains unchanged.

Specifically, the method for adjusting Δ (^ when the update sub-unit 114 satisfies the preset condition may be as follows:

The average number of times the two transmission modes are used and the average of the spectral efficiency are counted in a preset window length (usually the empirical value). If the number of times RI=1 is used is lower than a preset threshold (usually the empirical value, the window is available). The longer 5%), and the average spectral efficiency of RI=2 in the window length is less than the maximum spectral efficiency that RI=1 can support, then the Δ(^ correction of RI=1 is corrected, and the correction is performed according to the following formula:

AMCS = AMCS + Amcs _ril

Otherwise, if the number of times RI=2 is used is lower than a preset threshold (usually the empirical value, 5% of the window length may be taken), and the average spectral efficiency of RI=1 in the window length is greater than that supported by RI=1. Small spectral efficiency (usually empirical value, which can be taken as the spectral efficiency corresponding to RI=1 when MCS=5), then the CS of RI=2 is corrected, and the correction is performed according to the following formula:

AMCS = AMCS + Amcs _ri2

Δ«^„^ρ Δ«^„· ₂ is a preset step value, which is an integer greater than zero. It can be taken as L. In this embodiment, the outer loop adjustment parameter can be obtained by AMC or the preset condition is met. A CS adjusts to correct the spectral efficiency of the transmission mode corresponding to the A CS, and avoids the spectral efficiency estimation error caused by Δ (^ inaccuracy.

The present invention further provides a further embodiment of the apparatus for adaptive transmission mode scheduling according to the present invention. In the above embodiment, the selection module 20 is further configured to:

When the spectrum efficiency of the two transmission modes is the same, the transmission mode of the last scheduling moment is selected as the transmission mode of the current scheduling; if the scheduling is the first scheduling, the transmission diversity mode is selected as the transmission mode.

If the spectral efficiency of the two transmission modes is consistent, the selection module 20 selects the last scheduling moment. The transmission mode used is used as the transmission mode of the current data transmission; if the current scheduling is the first scheduling, the selection module 20 selects the transmission diversity mode as the transmission mode, that is, R=l.

In this embodiment, a selection is made for a transmission mode when the spectral efficiencies of the two transmission modes are the same. The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent flow transformation made by the specification and the drawings of the present invention 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.

Claims

Claim

A method for adaptive transmission mode scheduling, wherein the method comprises:

Correct the spectral efficiency when the preset conditions are met;

A transmission mode with a high spectral efficiency is selected as the transmission mode of the current scheduling.

2. The method for adaptive transmission mode scheduling according to claim 1, wherein the spectrum efficiency of the two transmission modes according to the CQI reported by the terminal and the Δ (^, timing estimation) maintained by the base station is:

Get the CQI and Δ (^; of the two transmission modes

Calculating two modes of modulation coding scheme MCS according to the CQI sum;

According to the MCS of the two modes, a mapping table of preset MCS and spectral efficiency is searched, and spectral efficiencies of the two modes are obtained.

3. The method of adaptive transmission mode scheduling according to claim 2, wherein the acquiring the CQI of the two transmission modes is:

Filtering the CQI of the two transmission modes separately to obtain the final two transmission modes.

CQI.

4. The method of adaptive transmission mode scheduling according to claim 2 or 3, wherein the acquiring the CS of the two transmission modes is:

The AMC updates and/or updates to the preset conditions when adaptive modulation is applied.

The method of adaptive transmission mode scheduling according to any one of claims 1 to 3, wherein the method further comprises: When the spectrum efficiency of the two transmission modes is the same, the transmission mode of the last scheduling moment is selected as the transmission mode of the scheduling;

6. An apparatus for adaptive transmission mode scheduling, wherein the apparatus comprises: an estimation module, a correction module, and a selection module; wherein

The apparatus for adaptive transmission mode scheduling according to claim 6, wherein the estimation module comprises: an acquisition unit, a calculation unit, and a search unit;

The obtaining unit is configured to acquire CQI and Δ of two transmission modes (^;

The calculating unit is configured to calculate an MCS according to the CQI and the two modes. The searching unit is configured to search for a preset MCS and a spectrum efficiency mapping table according to the MCS of the two modes, and obtain two types of mappings. The spectral efficiency of the mode.

The apparatus for adaptive transmission mode scheduling according to claim 7, wherein the obtaining unit comprises: a determining subunit, a converting subunit, and a filtering subunit; wherein

The apparatus for adaptive transmission mode scheduling according to claim 7 or 8, wherein the acquiring unit further comprises: The sub-unit is updated to be set to update S when the AMC is updated by adaptive modulation and/or when the preset condition is met.

The apparatus for adaptive transmission mode scheduling according to any one of claims 6 to 8, wherein the selection module is further configured to: