WO2012019449A1 - Procédé et système pour une commutation adaptative - Google Patents

Procédé et système pour une commutation adaptative Download PDF

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Publication number
WO2012019449A1
WO2012019449A1 PCT/CN2011/070899 CN2011070899W WO2012019449A1 WO 2012019449 A1 WO2012019449 A1 WO 2012019449A1 CN 2011070899 W CN2011070899 W CN 2011070899W WO 2012019449 A1 WO2012019449 A1 WO 2012019449A1
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WO
WIPO (PCT)
Prior art keywords
base station
reported
terminal
previous frame
spectrum efficiency
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PCT/CN2011/070899
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English (en)
Chinese (zh)
Inventor
姚春峰
王希维
张娟
刘巧艳
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2012019449A1 publication Critical patent/WO2012019449A1/fr

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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
    • H04B7/0413—MIMO systems

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an adaptive handover method and system.
  • Multi-input Multi-output (MIMO) technology in Long Term Evolution (LTE) systems is a wireless transmission technology using multiple transmit antennas ( ⁇ ⁇ ) and multiple receive antennas ( N R ) , can effectively improve the capacity of the wireless network and link transmission performance.
  • LTE Long Term Evolution
  • N R multiple receive antennas
  • RI rank indicator
  • Transmit diversity is more robust than spatial multiplexing performance, while spatial multiplexing can achieve higher peak rates relative to transmit diversity. Therefore, two transmit modes need to be selected based on actual channel conditions.
  • a switching algorithm of the transmission mode 3 is provided in the prior art.
  • the main problem with the above handover algorithm is that the handover of the RI depends only on the characteristics of the RI sequence reported by the UE.
  • the switching of the RI in the prior art only depends on the characteristics of the RI sequence reported by the UE, and does not consider the spectral efficiency (the spectral efficiency in this paper is defined as the original number of bits transmitted on the unit subcarrier).
  • the impact of MIMO mode switching which affects system throughput.
  • the technical problem solved by the present invention is to provide an adaptive switching method and system, which can select a frequency
  • a spectrally efficient MIMO transmission method effectively increases system throughput.
  • the present invention provides an adaptive handover method, where the method includes: when the rank indicator (RI) reported by the terminal last time is inconsistent with the RI used by the base station to transmit data of the previous frame, The spectrum efficiency of the transmission mode corresponding to the RI reported by the terminal last time. If the estimated spectrum efficiency is higher than the spectrum efficiency of the RI corresponding to the RI used by the base station in the previous frame, the base station uses the terminal to report the last time. The RI sends data. The method further includes: when the RI reported by the terminal last time is compared with the RI used by the base station to send data in the previous frame; or the RI reported by the terminal last time is inconsistent with the RI used by the base station to send data in the previous frame. However, when the estimated spectral efficiency is equal to or lower than the spectral efficiency of the transmission mode corresponding to the RI used by the base station in the previous frame, the base station still uses the RI used in the previous frame to transmit data. among them,
  • the method further includes: calculating a block error rate (BLER) and obtaining a value of the A CS according to different values of the RI used by the terminal and the RI used by the base station to transmit data.
  • BLER block error rate
  • the method further includes: counting, when the last reported RI of the terminal is equal to 2, and transmitting data by using the previous frame by the base station
  • the spectrum efficiency of the transmission mode corresponding to the RI that is last reported by the terminal is greater than the spectrum efficiency of the maximum MCS that can be used in the diversity mode, and the base station uses the frame.
  • the RI that the terminal last reported sent data is greater than the spectrum efficiency of the maximum MCS that can be used in the diversity mode, and the base station uses the frame.
  • the present invention further provides an adaptive handover system, the system being applied to a Long Term Evolution System (LTE) downlink transmission mode 3, the system comprising a rank indicator comparison unit and a handover decision unit in a base station , among them:
  • the rank indicator comparison unit is configured to: compare whether the rank indicator (RI) reported by the terminal last time is consistent with the RI used by the base station to transmit data, and if not, notify the handover decision unit of the result of the inconsistency;
  • the handover decision unit is configured to: after receiving the result of the inconsistency, estimate a spectrum efficiency of a transmission mode corresponding to the RI reported by the terminal last time, if the estimated spectrum efficiency is higher than that of the RI used by the base station of the previous frame.
  • the spectrum efficiency of the transmission mode determines that the base station transmits the data of the RI that was last reported by the terminal. among them,
  • the rank indicator comparison unit is further configured to: if it is determined that the RI reported by the terminal last time is compared with the RI used by the base station to send data of the previous frame, the result of the agreement is notified to the handover decision unit;
  • the handover decision unit is further configured to: according to the result of the consistency, determine that the base station still uses the RI used to transmit data in the previous frame. among them,
  • the handover decision unit is further configured to: after receiving the result of the inconsistency, if the estimated spectral efficiency is equal to or lower than the spectrum efficiency of the transmission mode corresponding to the RI used by the base station in the previous frame, determining the base station frame The data is still sent using the RI used in the previous frame.
  • the system further includes an outer loop adjustment parameter obtaining unit, where the outer loop adjustment parameter obtaining unit is configured to: separately calculate according to different values of the RI reported by the terminal and the RI used by the base station to send data.
  • the handover decision unit is further configured to: when the value of the outer loop adjustment parameter A CS is less than 0, determine that the estimated spectral efficiency is higher than before The spectral efficiency of the transmission method corresponding to the RI used by one base station.
  • BLER block error rate
  • the switching decision unit is further configured to: count the number of times when the RI of the last time the "RI" of the terminal is equal to 2 and the RI used by the base station to send data in the previous frame is equal to 1, when the number of statistics exceeds a predetermined threshold If the spectrum efficiency of the transmission mode corresponding to the RI reported by the terminal is greater than the spectrum efficiency corresponding to the maximum MCS that can be used in the diversity mode, the base station frame is determined to use the RI transmission data that is last reported by the terminal.
  • the spectrum efficiencies corresponding to the two transmission modes are respectively estimated and compared, and whether to perform the handover according to the comparison result is determined.
  • the transmission mode with higher spectral efficiency is selected, which effectively improves the system throughput.
  • FIG. 1 is a schematic flowchart of a method for adaptive handover in an LTE downlink transmission mode 3 according to an embodiment of the present invention.
  • the basic idea of the present invention is to provide an adaptive handover method, which is applied to the LTE downlink transmission mode 3, and the core content thereof includes: when the RI of the data transmitted by the base station of the previous frame is inconsistent with the RI reported by the UE last time, respectively, the estimation is performed.
  • the spectral efficiency of the two transmission modes of diversity and spatial multiplexing, and the selection of the MIMO transmission mode with high spectral efficiency, can effectively improve the system throughput.
  • the present invention combines the existing Adaptive Modulation and Coding (AMC) outer loop adjustment parameter De/toA/GS (also called A CS ) to estimate two transmission modes: transmit diversity and spatial multiplexing. Spectral efficiency.
  • AMC Adaptive Modulation and Coding
  • De/toA/GS also called A CS
  • Step 1 Determine the initial value of A CS, A CS maximum value, A CS minimum value, Block Error Ratio (BLER) upper limit value, and BLER lower limit.
  • the initial value of A CS is 0, the maximum value of A CS (value range 1-10), the minimum value (range -20 to -1), and the upper limit of BLER (value range 15% to 50%) , BLER lower limit (value range 0% to 8%).
  • Step 2 If the BLER sample value (10 to 100 sub-frames of the sample period) is consecutive N (value range 1-10) times lower than the lower limit value, then A CS is increased by 1 but not exceeding the maximum value of A CS If the BLER sample value is consecutive K (value range 1-10) times higher than the upper limit value, A CS is decremented by 1, but not less than A CS minimum; otherwise, A CS remains unchanged.
  • four AMC outer ring adjustment parameters are used to switch the MIMO transmission mode, respectively, as A CS1, AMCS2, A CS3 and A CS4, and provide the corresponding outer loop parameter acquisition process.
  • a CS1, AMCS2, AMCS3, and A CS4 are obtained according to BLER1, BLER2, BLER3, and BLER4, respectively.
  • BLER1, BLER2, BLER3, and BLER4 are calculated by the corresponding Acknowledgement (ACK) / Negative Acknowledgement (NACK).
  • the present invention provides an adaptive handover method, which specifically uses the following technical solution:
  • the RI reported by the terminal is not consistent with the RI used by the base station to transmit data in the previous frame
  • the RI that the terminal last reported is estimated.
  • the spectrum efficiency of the corresponding transmission mode if the estimated spectrum efficiency is higher than the spectrum efficiency of the transmission mode corresponding to the RI used by the base station in the previous frame, the base station transmits the data using the RI reported by the terminal last time.
  • the RI reported by the terminal is the same as the RI used by the base station to transmit data in the previous frame; or the RI reported by the terminal is not consistent with the RI used by the base station to transmit data in the previous frame, but the estimated spectrum efficiency is equal to
  • the base station still uses the RI used in the previous frame to transmit data.
  • the RI reported by the three-frame terminal is 1, that is, the RI of the UE last time. Further, when the value of the outer loop adjustment parameter A CS is less than 0, it is determined that the estimated frequency efficiency is higher than the frequency efficiency of the transmission method corresponding to the RI used by the base station of the previous frame. Further, according to the last reported RI of the terminal and the data transmitted by the base station in the previous frame, For different values of the RI, the block error rate BLER is separately calculated and the value of the CS is obtained. Further, when the RI of the last time reported by the terminal is equal to 2, the number of times the RI used by the base station to transmit data is equal to 1 when the number of statistics exceeds a predetermined threshold and the spectrum efficiency of the terminal is the most recent.
  • the base station transmits data using the RI reported by the terminal last time. Specifically, according to the RI of the data transmitted by the base station in the previous frame and the value of the last reported RI of the UE, the following four processes are respectively provided (for the first time that the UE is scheduled, the RI of the data transmitted by the base station in the previous frame is the closest to the UE. The value of RI reported once is the same). Flow A: If the RI of the data transmitted by the base station in the previous frame is equal to 1 and the RI reported by the UE last time is equal to 1, the handover procedure A is entered.
  • Step A1 The spectrum efficiency corresponding to an MCS is the closest to the spectrum efficiency corresponding to the reported channel quality indicator (CQI), and the MCS is recorded as MCS imt .
  • Step A2: The MCS of the final base station transmitting data is: MCS use max(min(( C ⁇ rai + AMCSl), MCS _Max), MCS _Min) where MCS_M «x represents the MCS maximum value specified by the protocol, and for the LTE system is 28 .
  • MCS _M « represents the minimum MCS specified by the protocol, and is 0 for the LTE system.
  • Step A3 The base station transmits data using RI equal to 1 in this frame.
  • Process B is entered. Process B is divided into the following steps:
  • Step B2 The MCS of the final base station transmitting data is:
  • Step B3 The base station transmits data using RI equal to 2 in this frame.
  • Step B4 The UE feeds back the ACK/NACK information of the current frame for calculating BLER2 and acquiring the outer loop parameter A CS2.
  • Step C3 Calculate the mean value of T-R2-tmpl in the window, denoted as T-R2, and use the sliding window method, and the window length is M (value range 5-100).
  • Step C4 The base station uses RI equal to 2 for this frame, and uses MC M to transmit data.
  • Step C6 The UE feeds back the ACK/NACK information of the current frame to calculate the BLER2 and outer ring parameters.
  • Step C7 The base station uses the RI equal to 1 to transmit data.
  • Step C8 Determine MG ⁇ ., according to T_R2_tmpl in step C2, the principle is that the spectral efficiency corresponding to a certain MCS is closest to T-R2-tmpl. Further, the MCS of the transmitted data is determined according to the following formula.
  • MCS use max(min(( C ⁇ ira , AMCS4), MCS_Max), MCS _Min)
  • MCS_M «x represents the maximum MCS specified by the protocol, and 28 for the LTE system.
  • MCS_M « represents the minimum MCS specified by the protocol, and is 0 for the LTE system.
  • Step D1 further judge according to the value of A CS3. If A CS3 is greater than or equal to 0, perform steps D2 to D7. If A CS3 is less than 0, perform steps D8 to D1 l.
  • Step D2 The base station transmits data using RI equal to 2 in this frame.
  • Step D3 The spectrum efficiency corresponding to an MCS is closest to the spectrum efficiency corresponding to the reported CQI, and the MCS is recorded as MCS init .
  • MCS SFBC is obtained by:
  • MCS max min(( C ⁇ . ra , AMCS ⁇ ), MCS _Max), MCS _Min) where MCS_M «x represents the maximum MCS specified by the protocol, and 28 for the LTE system.
  • Step D4 Calculate the spectral efficiency corresponding to MC ⁇ BC , and divide it by 2 and record it as r.
  • Step D5 The spectrum efficiency corresponding to an MCS is closest to ⁇ , and the MCS is recorded as
  • Step D6 The MCS of the final base station transmitting data is:
  • MCS use max(min(( C ⁇ . ra , SM + AMCS3), MCS_Max , MCS _Min)
  • MCS_M «x represents the maximum MCS specified by the protocol, and for the LTE system is 28.
  • Step D10 The spectrum efficiency corresponding to an MCS is the closest to the spectrum efficiency corresponding to the reported CQI, and the MCS is recorded as MCS. Imt The MCS of the final base station to send data is:
  • Step D1 The UE feeds back the ACK/NACK information of the current frame for calculating the acquisition of the BLER1 and the outer loop parameter A CS1.
  • Step 101 Parameter initialization includes outer loop adjustment parameters, BLER, T_R2_tmpl value in the window, C_R1R2 and T_R2;
  • Step 102 determining whether the RI of the upper frame is equal to the RI reported by the UE at the current time, if yes, executing step 103; if not,
  • Step 104 Step 103: Send data using the RI reported by the UE last time;
  • step 105 determines whether the corresponding DeltaMCS is non-negative, and RI
  • an embodiment of the present invention further provides an adaptive handover system (not shown), which is applied to the LTE downlink transmission mode 3.
  • the adaptive handover system in this embodiment includes a rank indicator comparison unit and a handover decision in the base station. Unit, where: The rank indicator comparison unit is configured to: compare whether the RI reported by the terminal last time is consistent with the RI used by the base station to transmit data of the previous frame, and if not, notify the handover decision unit of the result of the inconsistency;
  • the handover decision unit is configured to: after receiving the result of the inconsistency, estimate a spectrum efficiency of a transmission mode corresponding to the RI reported by the terminal last time, if the estimated spectrum efficiency is higher than an RI used by the base station of the previous frame The spectrum efficiency of the corresponding transmission mode determines that the base station uses the RI transmission data that is last reported by the terminal. Further, the rank indicator comparing unit is further configured to: if it is determined that the RI reported by the terminal last time is compared with the RI used by the base station to send data of the previous frame, notify the handover decision unit of the result of the consistency; The handover decision unit is further configured to: according to the result of the agreement, determine that the base station still uses the RI transmission data used in the previous frame.
  • the handover decision unit is further configured to: after receiving the result of the inconsistency, if the estimated spectral efficiency is equal to or lower than a spectrum efficiency of a transmission mode corresponding to the RI used by the base station in the previous frame, The base station still uses the RI used in the previous frame to transmit data.
  • the system further includes an outer loop adjustment parameter obtaining unit, where the outer loop adjustment parameter obtaining unit is configured to: according to different values of the RI reported by the terminal and the RI used by the base station to send data in the previous frame.
  • the handover decision unit is further configured to: when the value of the outer loop adjustment parameter A CS is less than 0, determine that the estimated spectrum efficiency is higher than The spectrum efficiency of the transmission mode corresponding to the RI used by the base station in the previous frame.
  • the handover decision unit is further configured to: count the number of times when the RI of the last time the terminal is up to 2 and the RI used by the base station to transmit data is equal to 1 when the number of statistics exceeds a predetermined threshold
  • the base station frame is determined to use the RI transmission data that is last reported by the terminal.
  • Step A2 The MCS of the final base station transmitting data is:
  • Step A3 The base station uses the RI equal to 1 to transmit data.
  • Step A4 The UE feeds back the ACK/NACK of this frame to calculate the BLER1 and outer ring parameters.
  • the spectral efficiency is 0.3770, according to the principle of spectral efficiency
  • Step C3 Calculate T—R2 by sliding window.
  • the average value of D-1, equal to ⁇ 2.4621, 2.9470, 3.3106, 3.5530, 0.4848 ⁇ is 2.5515. Contrast conditions, satisfying condition 2, so continue to execute C4, C5 and C6.
  • Step C6 The UE feeds back the ACK/NACK information of the current frame for calculating BLER2 and acquiring the outer loop parameter A CS2.
  • the RI of the data transmitted by the base station in the previous frame and the RI reported by the UE last time if the RIs of the two are inconsistent, the spectrum efficiencies corresponding to the two transmission modes are respectively estimated and compared, and the comparison result is determined according to the comparison result. Whether to perform handover; In addition, when estimating the corresponding spectrum efficiency, combined with the outer loop adjustment parameters, the transmission mode with higher spectral efficiency is selected, and the system throughput is effectively improved.

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

Abstract

La présente invention se rapporte à un procédé pour une commutation adaptative. Le procédé selon l'invention comprend les étapes consistant : à estimer, quand une indication de rang (RI, Rank Indication) la plus récemment rapportée par un terminal n'est pas cohérente avec une RI utilisée par une station de base quand la station de base transmet des données d'une trame précédente, l'efficacité du spectre de fréquence d'un mode de transmission correspondant à la RI la plus récemment rapportée par le terminal; et à amener la station de base qui utilise la RI la plus récemment rapportée par le terminal, à transmettre les données de la trame en cours si l'efficacité du spectre de fréquence estimée est plus élevée que l'efficacité du spectre de fréquence du mode de transmission correspondant à la RI utilisée par la station de base dans la trame précédente. La présente invention se rapporte en outre à un système pour une commutation adaptative. Le système selon l'invention s'applique à un mode de transmission sur la liaison descendante 3 d'un système d'évolution à long terme (LTE). Il comprend un module de comparaison de RI et un module de prise de décision de commutation de la station de base. La solution technique de la présente invention permet d'améliorer de façon significative le rendement du système.
PCT/CN2011/070899 2010-08-10 2011-02-09 Procédé et système pour une commutation adaptative WO2012019449A1 (fr)

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WO2014094293A1 (fr) * 2012-12-21 2014-06-26 华为技术有限公司 Procédé et dispositif pour acquérir une valeur d'indicateur de qualité de canal
CN103684555B (zh) * 2013-12-11 2016-09-07 北京北方烽火科技有限公司 一种上行信道的mimo模式内切换方法和装置
CN112383333B (zh) * 2020-10-09 2022-09-02 杭州红岭通信息科技有限公司 一种秩试探和赋形权计算的方法
CN116505993B (zh) * 2023-06-25 2023-10-24 极芯通讯技术(南京)有限公司 秩指示的自适应调整方法、设备、装置及存储介质

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CN101777965A (zh) * 2010-01-12 2010-07-14 中兴通讯股份有限公司 信道状态信息反馈方法和用户终端

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