WO2012139398A1 - Procédé et dispositif pour l'ordonnancement adaptatif du mode de transmission - Google Patents

Procédé et dispositif pour l'ordonnancement adaptatif du mode de transmission Download PDF

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Publication number
WO2012139398A1
WO2012139398A1 PCT/CN2011/083889 CN2011083889W WO2012139398A1 WO 2012139398 A1 WO2012139398 A1 WO 2012139398A1 CN 2011083889 W CN2011083889 W CN 2011083889W WO 2012139398 A1 WO2012139398 A1 WO 2012139398A1
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WO
WIPO (PCT)
Prior art keywords
transmission mode
cqi
scheduling
modes
transmission
Prior art date
Application number
PCT/CN2011/083889
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English (en)
Chinese (zh)
Inventor
王希维
姚春峰
张娟
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中兴通讯股份有限公司
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Publication of WO2012139398A1 publication Critical patent/WO2012139398A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

Definitions

  • 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
  • WiMAX Worldwide Interoperability for Microwave Access
  • OFDM frequency division multiple access
  • CDMA Code-Division Multiple Access
  • MIMO Multiple Input Multiple Output
  • 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.
  • 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.
  • 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;
  • the transmission mode with high spectral efficiency is selected as the transmission mode of the current scheduling.
  • 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:
  • the mapping table of the preset MCS and the spectrum efficiency is searched, and the spectral efficiency of the two modes is obtained.
  • the obtaining the CQI of the two transmission modes comprises:
  • the CQIs of the two transmission modes are respectively filtered to obtain CQIs of the final two transmission modes.
  • the obtaining ⁇ of the two transmission modes is ( ⁇ is:
  • the method for the adaptive transmission mode scheduling further includes:
  • the transmission mode of the last scheduling moment is selected as the transmission mode of the 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 ⁇ 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.
  • the estimating module comprises: an obtaining unit, a calculating unit and a searching unit; wherein the acquiring unit is configured to acquire CQI and ⁇ 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.
  • 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.
  • the acquiring unit further includes:
  • the selection module is further configured to:
  • the transmission mode of the last scheduling moment is selected as the transmission mode of the scheduling
  • the transmit diversity mode is selected as the transmission mode.
  • 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.
  • mode 3 due to the inaccurate RI reported by the terminal, the error transmission mode is selected, and the system throughput performance is poor.
  • 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
  • FIG. 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
  • FIG. 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. 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
  • an embodiment of an adaptive transmission mode scheduling method according to the present invention 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;
  • 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 ⁇ ⁇ 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.
  • the correction of the spectral efficiency is generally: updating ⁇ ⁇ ?, calculating the MCS of the two modes according to the CQI and the updated ⁇ ( ⁇ , and then searching for the preset MCS and the spectral efficiency mapping table, the spectral efficiency Make corrections to get more accurate spectral efficiency.
  • a spectrally efficient transmission mode is selected as the transmission mode of the delivered data.
  • 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.
  • step S10 may further include:
  • Step S101 Obtain CQI and ⁇ of two transmission modes
  • Step S102 Calculate two modes of MCS according to the CQI and ⁇ ⁇ ;
  • 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 ⁇ ( ⁇ 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:
  • 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.
  • the spectral efficiency of the two transmission modes is obtained by a preset mapping table of MCS and spectrum efficiency (according to simulation).
  • 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.
  • step S101 may further include:
  • Step S1011 Determine a transmission mode corresponding to the CQI reported by the terminal
  • the two transmission modes use the CQI used in the previous scheduling moment.
  • 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:
  • Step S1013 Filter CQIs of the two transmission modes to obtain CQIs of the final two transmission modes.
  • 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 " € ( ⁇ ). If the CQI reporting time is reported for the first time, the filter coefficient is " 0.
  • 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.
  • 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 ⁇ obtained by AMC ( ⁇ and satisfies Adjustment of ⁇ ( ⁇ ) when the condition is preset.
  • 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 ⁇ ( ⁇ 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
  • AMCS AMCS + Amcs ril
  • AMCS AMCS + Amcs ri2
  • Am" ril and ⁇ "7"' ⁇ ' 2 are preset step values, which are integers greater than zero. It is preferable to use L.
  • 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 ⁇ ( ⁇ inaccuracy).
  • 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.
  • an embodiment of an apparatus for adaptive transmission mode scheduling includes: an estimation module 10 configured to adjust a parameter ⁇ ( ⁇ 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.
  • 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 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.
  • the selection of the transmission mode based on the spectrum efficiency can select the ⁇ 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.
  • 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.
  • 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:
  • 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:
  • 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).
  • 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.
  • 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.
  • 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 CQI of another transmission mode is converted by the conversion sub-unit 112 to the reported CQI.
  • the conversion method of CQI can be:
  • the filtering sub-unit 113 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:
  • 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.
  • 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.
  • 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 ⁇ ( ⁇ 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 ⁇ ⁇ full BLER ⁇ Th blerl , then ⁇ ( ⁇ remains unchanged.
  • the method for adjusting ⁇ ( ⁇ when the update sub-unit 114 satisfies the preset condition may be as follows:
  • AMCS AMCS + Amcs ril
  • a preset threshold usually the empirical value, 5% of the window length may be taken
  • AMCS AMCS + Amcs ri2
  • ⁇ « ⁇ paper ⁇ ⁇ « ⁇ cultural ⁇ 2 is a preset step value, which is an integer greater than zero. It can be taken as L.
  • 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 ⁇ ( ⁇ inaccuracy.
  • the present invention further provides a further embodiment of the apparatus for adaptive transmission mode scheduling according to the present invention.
  • the selection module 20 is further configured to:
  • 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.
  • the selection module 20 selects the last scheduling moment.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un procédé et un dispositif destinés à un ordonnancement adaptatif d'un mode de transmission. Le procédé consiste à : estimer périodiquement le rendement spectral de deux modes de transmission selon un indicateur de qualité de canal (CQI) rapporté par un terminal et selon un paramètre de réglage de boucle externe ΔMCS maintenu par une station de base; corriger le rendement spectral lorsqu'une condition prédéfinie est satisfaite; et sélectionner le mode de transmission ayant le plus grand rendement spectral en tant que mode de transmission pour l'ordonnancement courant. Dans la présente invention, le mode de transmission est sélectionné sur la base du rendement spectral, le mode de transmission MIMO ayant le plus grand rendement spectral peut être sélectionné de sorte que le débit du système soit réellement amélioré, et le problème lié au mode de transmission mal sélectionné et aux faibles performances de débit du système dues à l'indicateur de rang (RI) incorrect rapporté par un terminal dans le mode de transmission 3 en liaison descendante d'un système LTE à double antenne est résolu.
PCT/CN2011/083889 2011-04-12 2011-12-13 Procédé et dispositif pour l'ordonnancement adaptatif du mode de transmission WO2012139398A1 (fr)

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Application Number Priority Date Filing Date Title
CN2011100907443A CN102739342A (zh) 2011-04-12 2011-04-12 自适应传输模式的方法及装置
CN201110090744.3 2011-04-12

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CN102970717B (zh) * 2012-11-27 2015-07-22 北京北方烽火科技有限公司 一种lte系统不同下行传输模式间的切换方法及装置
CN104079367B (zh) * 2013-03-25 2017-09-12 中国移动通信集团公司 传输模式切换方法及装置
WO2014179917A1 (fr) * 2013-05-06 2014-11-13 Telefonaktiebolaget L M Ericsson (Publ) Procede et dispositif d'adaptation de rang
CN103442398B (zh) * 2013-08-13 2016-12-28 大唐移动通信设备有限公司 一种基于lte系统传输模式的切换方法及装置
CN103731871B (zh) * 2013-12-25 2017-02-22 上海华为技术有限公司 一种信息配置方法及装置
CN105099621B (zh) * 2015-06-29 2018-05-22 珠海市魅族科技有限公司 通信方法和通信设备
CN107437975A (zh) * 2016-05-25 2017-12-05 北京信威通信技术股份有限公司 一种mimo 方式切换控制方法和装置
CN110278562B (zh) * 2018-03-14 2023-05-02 中国移动通信有限公司研究院 传输模式自适应方案评估方法、装置和可读存储介质
CN110677177B (zh) * 2018-07-03 2021-06-04 中国移动通信有限公司研究院 一种自适应选择传输模式的方法及基站
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