WO2012019403A1 - Procédé et appareil de codage et de modulation adaptatifs - Google Patents

Procédé et appareil de codage et de modulation adaptatifs Download PDF

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Publication number
WO2012019403A1
WO2012019403A1 PCT/CN2010/079400 CN2010079400W WO2012019403A1 WO 2012019403 A1 WO2012019403 A1 WO 2012019403A1 CN 2010079400 W CN2010079400 W CN 2010079400W WO 2012019403 A1 WO2012019403 A1 WO 2012019403A1
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WO
WIPO (PCT)
Prior art keywords
cqi
mcs
terminal
reported
nack
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PCT/CN2010/079400
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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 WO2012019403A1 publication Critical patent/WO2012019403A1/fr

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Classifications

    • 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
    • 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
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to an adaptive modulation and coding method and apparatus. Background technique
  • LTE Long Term Evolution
  • B3G Third Generation in mobile communication system
  • 4G, Fourth Generation fourth-generation mobile communication technology
  • LTE uses OFDM (Orthogonal Frequency Division Multiplexing) technology in the air interface instead of 3GPP's long-term code-division Mut- ple access (CDMA) technology, and uses multiple input and multiple outputs.
  • CDMA Code-division Mut- ple access
  • Input , Multiple Input Multiple Output technology and adaptive technology to improve data rate and system performance, so it will become the core technology of future cellular mobile communication systems, wireless broadband access systems and other systems.
  • Adaptive Modulation and Coding is a technique that changes the modulation scheme and code rate according to changes in real-time channel conditions.
  • a low-order modulation method and a low code rate can be used for a terminal having a poor channel condition
  • a high-order modulation method and a high code rate can be used for a terminal having a good channel condition.
  • the AMC technology can increase the data transmission rate of a terminal with poor channel conditions, thereby increasing the average throughput of the system.
  • AMC improves system performance by changing the modulation and coding scheme (MCS, Modulation and Coding Scheme) rather than by changing the transmission power, thereby reducing system interference.
  • MCS modulation and coding scheme
  • a downlink adaptive modulation and coding method and a base station in an orthogonal frequency division multiplexing system are proposed.
  • the method adjusts a corresponding value by adjusting a carrier-to-interference-and-noise ratio adjustment value.
  • the prior art also includes an adaptive code modulation method in which the threshold of the MCS is updated in real time according to the check result of the Cyclic Redundancy Check (CRC).
  • CRC Cyclic Redundancy Check
  • the above technical solution does not consider the initial stage of the system, the initial value of the MCS threshold may not match the system performance, and does not consider different signal to interference plus noise ratio (SINR) intervals, MCS threshold The amount of adjustment is different.
  • SINR signal to interference plus noise ratio
  • the adaptive code modulation method in the prior art has an unreasonable MCS selection due to different capability levels of the terminal, different channel types, and/or unreasonable adaptive modulation and coding methods.
  • the present invention provides an adaptive modulation and coding method and apparatus, which solves the problem that the MCS selection is unreasonable due to different capability levels of the terminal, different channel types, and/or unreasonable adaptive modulation and coding methods existing in the prior art, and the terminal Poor throughput performance and poor BLER metrics.
  • the present invention provides an adaptive modulation and coding method, the method comprising:
  • the CQI parameter corresponding to the CQI reported by the terminal is initialized according to the channel quality indicator (CQI, Channel Quality Indicator) reported by the terminal; and the CQI parameter corresponding to the ACK/NACK is updated according to the positive acknowledgement (ACK) I negative acknowledgement (NACK) reported by the terminal.
  • the final MCS is determined based on the CQI and updated CQI parameters on the terminal.
  • the present invention also provides an adaptive modulation and coding apparatus, the apparatus comprising: a CQI initialization module, a CQI status update module, and an MCS correction module;
  • the CQI initialization module is configured to initialize a CQI parameter corresponding to the CQI reported by the terminal according to the CQI reported by the terminal;
  • a CQI status update module configured to update a CQI parameter corresponding to the ACK/NACK according to the ACK/NACK reported by the terminal;
  • the MCS correction module is configured to determine the final MCS according to the CQI reported by the terminal and the updated CQI parameter.
  • the present invention solves the problem that different terminals in the prior art report different CQIs in different degrees by calculating different correction values for the CQI reported by the terminal.
  • the present invention divides the state of the CQI into an unstable state and a stable state. Different AMC processes are used in the two states, so that the appropriate MCS can be selected more accurately.
  • the present invention can select the maximum MCS that satisfies the condition according to the set BLER threshold by counting the BLER of each MCS under the CQI.
  • the BLER performance and the maximum throughput performance of the system when updating the BLER state of the CQI, the present invention updates the BLER of a group of MCSs satisfying the condition according to the reported ACK/NACK, thereby shortening the time of the initialization process.
  • FIG. 1 is a flowchart of an adaptive modulation and coding method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of an adaptive modulation and coding method according to an embodiment of the present invention
  • FIG. 3 is a flowchart of detailed processing of an adaptive modulation and coding method according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an adaptive modulation and coding apparatus according to an embodiment of the present invention. detailed description
  • the method of the present invention mainly includes: initializing the CQI parameter corresponding to the CQI reported by the terminal according to the CQI reported by the terminal; updating the CQI parameter corresponding to the ACK/NACK according to the ACK/NACK reported by the terminal; and calculating the CQI and the CQI reported by the terminal. Updated CQI parameters to determine the final MCS.
  • FIG. 1 is a flowchart of an adaptive modulation and coding method according to an embodiment of the present invention.
  • the adaptive modulation coding method of the example includes the following processing:
  • Step 101 In the case that the CQI reported by the terminal first appears, record the CQI reported by the terminal, and initialize the parameters of the CQI reported by the terminal. After performing the initialization, perform step 102, and determine that the CQI reported by the terminal does not appear for the first time. In the case, step 102 is directly executed, where the foregoing parameters include: a status flag bit of whether the CQI enters a steady state, an MCS correction value corresponding to the CQI, a block error rate of all MCSs selectable under the CQI, and the CQI The number of uses of each MCS;
  • initializing the parameters of the CQI reported by the terminal specifically includes the following processing:
  • the status flag bit in the CQI parameter reported by the initialization terminal is an unstable state; wherein the status flag bit includes two values of an unstable state and a stable state.
  • the parameters of the CQI reported by the terminal are initialized.
  • the MCS correction value corresponding to the CQI reported by the terminal is zero; if the CQI reported by the terminal is not the first reported CQI (that is, the CQI recorded by the terminal, the CQI has recorded other CQIs before, and has been recorded.
  • the CQI is different from the CQI
  • the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter reported by the terminal is initialized according to a predetermined rule
  • the predetermined rule includes: determining whether there is a CQI in which the status flag bit is in a stable state in the record, If yes, the state flag is calculated as the average value of the MCS correction value corresponding to the CQI of the steady state, and after rounding down, the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter reported by the terminal is initialized.
  • the average value of the MCS correction values corresponding to all CQIs except the CQI recorded in this record is calculated, and is downward.
  • the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter reported by the terminal is the value obtained by rounding down the average value.
  • the CQI reported by the terminal is mapped to the initial value of the MCS according to the mapping relationship between the CQI and the initial value of the MCS.
  • the MCS initial value is corrected in a predetermined manner according to the MCS correction value corresponding to the CQI reported by the terminal.
  • the modified MCS wherein the corrected MCS ranges from 0 to 28, wherein the predetermined manner includes: adding the MCS correction value corresponding to the CQI of the terminal to the MCS initial value;
  • the value of the MC of the CQI reported by the terminal is initialized to 0 from the 0 to the final MCS, and the block error rate of the final MCS+1 to 28 is initialized to 1 by the CQI of the terminal.
  • the value ranges from 0 to 28, indicating the value of 29 MCS.
  • step 102 If the CQI reported by the terminal does not appear for the first time, go directly to step 102.
  • Step 102 Update a block error rate of the CQI corresponding to the ACK/NACK according to the ACK/NACK reported by the terminal, and further update the ACK/ in the case that the status flag of the CQI corresponding to the ACK/NACK is unstable.
  • step 102 according to the ACK/NACK reported by the terminal, first determine the CQI and MCS corresponding to the ACK/NACK on the terminal, and record the number of occurrences of the CQI corresponding to the ACK/NACK of the terminal on the terminal. ⁇ and the number of reported NACK nack n , and calculate a segmentation block rate of the window length closest to the current subframe under the CQI corresponding to the ACK/NACK reported by the terminal, where corresponding to the ACK/NACK of the terminal
  • the values of CQI and MCS are il and j 1 , respectively.
  • the value of i ranges from 0 to 15. It represents the value of 16 CQIs.
  • the value of j ranges from 0 to 28, indicating the value of 29 MCS.
  • the block error rate BLER (il , j,) of j jl ⁇ 28 under CQI corresponding to the NACK of 4 ⁇ on the terminal.
  • step 102 when the status flag bit of the CQI corresponding to the ACK/NACK is in an unstable state, it is necessary to further update the MCS correction value of the CQI corresponding to the ACK/NACK, and the status flag bit, specifically
  • the set threshold value no and the number of reported NACKs nacku is less than or equal to the preset threshold value nacko
  • the MCS correction value AMC of the CQI corresponding to the ACK/NACK is unchanged; the threshold value no is reported and the NACK is reported.
  • the number nacku is less than or equal to the preset threshold value nack 0
  • AMCSu is unchanged
  • AMCSu is reduced by 1, 13 ⁇ 4 corpse 0, nacki corpse 0.
  • Step 103 When the status flag of the CQI reported by the terminal is unstable, obtain the final MCS according to the CQI of the terminal, and the MCS correction value of the CQI of the terminal, and the status flag of the CQI reported by the terminal. When the bit is stable, the final MCS is determined according to the CQI reported by the terminal and the block error rate corresponding to the CQI reported by the terminal.
  • the value of the CQI reported by the terminal is mapped to the initial value of the MCS according to the mapping relationship between the CQI and the initial value of the MCS;
  • the MCS correction value AMCS i2 corresponding to the CQI is performed on the MCS initial value in a predetermined manner to obtain the final MCS.
  • the predetermined manner includes: the MCS correction value corresponding to the CQI reported by the terminal and the MCS initial value. Add together.
  • the terminal When the status flag of the CQI reported by the terminal is stable, first select the maximum j of the block error rate BLER( i2j ) corresponding to the CQI reported by the terminal, which is less than or equal to the preset threshold; subsequently, according to the terminal reporting
  • the segmentation block error rate under CQI determines whether the segmentation block error rate is less than a preset threshold BLER lQW . If the judgment is yes, j adds a step value ⁇ , otherwise, j does not change; finally, according to j The value determines the final MCS.
  • FIG. 2 is a schematic flowchart of an adaptive modulation and coding method according to an embodiment of the present invention. As shown in FIG. 2, the following processing is included:
  • Step 201 Determine whether the CQI reported by the terminal appears for the first time. If the determination is yes, go to step 202. Otherwise, go to step 203 directly.
  • Step 202 Initialize the state parameter corresponding to the CQI reported by the terminal, and perform step 203.
  • Step 203 Update the BLER of the CQI corresponding to the ACK/NACK of the terminal and the MCS correction value, and perform step 204.
  • Step 204 Determine whether the CQI reported by the terminal enters a steady state. If the determination is yes, go to step 205. Otherwise, go to step 206.
  • Step 205 select MCS.
  • Step 206 Update the MCS correction value of the CQI, and select the MCS.
  • the maximum MCS that satisfies the condition is selected according to the set BLER threshold, so that the BLER performance and the maximum throughput performance of the system can be balanced; by updating the BLER state of the CQI according to the reported ACK. /NACK, updates the BLER of a group of MCSs that satisfy the condition, thereby reducing the time of the initialization process.
  • FIG. 3 is a flowchart of detailed processing of an adaptive modulation and coding method according to an embodiment of the present invention.
  • i represents a value of 16 types of CQI
  • j represents the value of 29 types of MCS. Its value ranges from 0 to 28.
  • the following processing is included:
  • Step 301 If the CQI of the terminal appears for the first time, the CQI is recorded, and four parameters of the CQI are initialized.
  • the specific treatment is as follows:
  • the flag bit equal to 0 indicates that the CQI is in an unstable state, and equal to 1 indicates that the CQI is in a stable state.
  • Step 3012 Initialize the MCS correction value corresponding to the CQI.
  • Step 3013 initializing the error rate BLER of all MCSs that may be selected under the CQI (",;
  • the value of j in the CQI is initialized from 0 to MCSfmal to 0, and the value of j is from the MCSfmal+1 to the BLER of 28 ( n is initialized to 1.
  • Step 3014 initialize the number of uses of each MCS under the CQI ⁇ ' ⁇ '; j from 0 to 28 Therefore, """3 ⁇ 4, initialized to 1. If the CQI reported by the terminal is not the first time, then go to step 302.
  • Step 302 Update the CQI corresponding to the ACK/NACK according to the value of the ACK/NACK.
  • Step 3021 updating the CQI
  • the value of ⁇ can be 200, and the formula 1 is updated ⁇ :
  • step 3022 If the CQI state of the CQI corresponding to the ACK/NACK is Q, step 3022 is performed; otherwise, the process proceeds to step 303.
  • Step 3022 Update ⁇ ° ⁇ to update whether the CQI enters a stable status flag when a certain condition is met.
  • the MCS is determined as follows:
  • the embodiment of the present invention solves the problem that different terminals have different CQI accuracy in the prior art by calculating different correction values ⁇ for the CQI reported by the terminal, and further, the present invention
  • the embodiment divides the state of the CQI into an unstable state and a stable state, and uses different AMC processes in the two states, so that a suitable MCS can be selected more accurately.
  • the embodiment of the present invention calculates the BLER of each MCS under the CQI, according to The set BLER threshold value selects the maximum MCS that satisfies the condition, so that the BLER performance and the maximum throughput performance of the system can be balanced.
  • the embodiment of the present invention updates the condition that satisfies the condition according to the reported ACK/NACK.
  • a set of MCS BLERs which can shorten the initialization process time.
  • the device of the present invention mainly includes the following:
  • the CQI initialization module is configured to initialize the CQI parameter corresponding to the CQI reported by the terminal according to the CQI reported by the terminal.
  • the CQI status update module is configured to update the CQI parameter corresponding to the ACK/NACK according to the ACK/NACK reported by the terminal.
  • the MCS correction module is configured to determine the final MCS according to the CQI reported by the terminal and the updated CQI parameter.
  • FIG. 4 is a schematic structural diagram of an adaptive modulation and coding apparatus according to an embodiment of the present invention.
  • the adaptive modulation and coding apparatus of the example includes: a CQI initialization module 40, a CQI status update module 41, and an MCS correction module 42.
  • the respective modules of the embodiments of the present invention will be described in detail below.
  • the CQI initialization module 40 is further configured to: when the CQI reported by the terminal first appears, record the CQI reported by the terminal, and initialize the parameters of the CQI reported by the terminal, where the parameters include: a status flag bit, an MCS correction value, and a selectable The block error rate of MCS and the number of uses of each MCS;
  • the CQI initialization module 40 further includes: a status flag bit initialization module, an MCS correction value initialization module, an MCS error block rate initialization module, and an MCS usage number initialization module, wherein the status flag bit initialization module is used to initialize the CQI parameters reported by the terminal.
  • the status flag of the MCS correction value is used to initialize the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter reported by the terminal; the MCS error block rate initialization module is used to initialize the CQI parameter reported by the terminal.
  • the block error rate of the MCS that can be selected; MCS makes The number of uses of each MCS in the parameters for initializing the CQI by the number of initialization modules is 1.
  • the MCS correction value initialization module is further configured to:
  • the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter of the initialization terminal is zero;
  • the initial predetermined rule according to the predetermined rule includes: determining whether there is a CQI in which the status flag bit is in a stable state in the record, and if so, calculating the CQI in which the status flag bit is in a stable state.
  • the average value of the corresponding MCS correction value is rounded down, and the MCS correction value corresponding to the CQI reported by the terminal in the CQI parameter reported by the terminal is initialized to a value obtained by rounding down the average value; If there is a CQI in which the status flag is a steady state, the average value of the MCS correction values corresponding to all CQIs except the CQI recorded in the record is calculated, and rounded down, and the parameters of the CQI reported by the terminal are initialized.
  • the MCS correction value corresponding to the CQI reported by the terminal is a value obtained by rounding down the average value.
  • the MCS error block rate initialization module further includes: a mapping sub-module, a correction sub-module, and an initialization sub-module, wherein the mapping sub-module is configured to map the CQI reported by the terminal to the initial value of the MCS according to the mapping relationship between the CQI and the initial value of the MCS.
  • the correction sub-module is configured to correct the MCS initial value in a predetermined manner according to the MCS correction value corresponding to the CQI reported by the terminal, and obtain the corrected MCS, wherein the corrected MCS ranges from 0 to 28, and the above reservation
  • the method is: adding the MCS correction value corresponding to the CQI reported by the terminal to the initial value of the MCS; the initialization sub-module is configured to initialize the value j of the MCS under the CQI reported by the terminal from 0 to the block error rate of the final MCS to 0.
  • the error block rate of the final MCS+1 to 28 is initialized to 1 by the CQI reported by the terminal, where j ranges from 0 to 28, indicating the value of 29 MCSs.
  • the CQI status update module 41 is further configured to update the block error rate of the CQI corresponding to the ACK/NACK according to the positive acknowledgement ACK/negative acknowledgement NACK reported by the terminal, and the status flag of the CQI corresponding to the ACK/NACK is unstable. In case of further updates with ACK/ The MCS correction value of the CQI corresponding to the NACK, and the status flag bit;
  • the CQI status update module 41 is further configured to:
  • the terminal reports the ACK / NACK, the number determining the terminal reports an ACK / NACK corresponding to the CQI and MCS, the recording and terminal 4 Burgundy ACK / NACK corresponding to the CQI appears ⁇ l and the number nack reporting the NACK u, and calculates The segmentation block error rate of the window length closest to the current subframe under the CQI corresponding to the ACK/NACK reported by the terminal, wherein the values of CQI and MCS corresponding to the ACK/NACK reported by the terminal are il and jl, respectively.
  • the value ranges from 0 to 15, which indicates the value of CQI in 16.
  • the value of j ranges from 0 to 28, indicating the value of 29 types of MCS.
  • the threshold value no and the number of reported NACKs nacku is less than or equal to a preset threshold value nack 0
  • the MCS correction value AMC of the CQI corresponding to the ACK/NACK is unchanged
  • the threshold no and the number of reported NACKs nacku is less than or equal to the preset threshold nack 0
  • the AMCSu is unchanged
  • the ACK /NACK corresponding CQI status flag bit CQI_stateii l;
  • AMCSu is reduced by 1, 13 ⁇ 4 corpse 0, nacki corpse 0.
  • the MCS correction module 42 is further configured to perform the correction.
  • the final MCS is obtained according to the CQI reported by the terminal and the MCS correction value of the CQI reported by the terminal;
  • the final MCS is determined according to the CQI reported by the terminal and the block error rate corresponding to the CQI reported by the terminal.
  • the MCS correction module 42 is further configured to map the value of the CQI reported by the terminal to the initial MCS according to the mapping relationship between the CQI and the initial value of the MCS.
  • the MCS initial value is corrected in a predetermined manner according to the MCS correction value AMCS i2 corresponding to the CQI reported by the terminal, and the final MCS is obtained, wherein the subscription mode is: the MCS correction value corresponding to the CQI reported by the terminal and the MCS initial value. ⁇ Straight force.
  • the MCS correction module 42 is further configured to select a block error rate BLER( i2j ) corresponding to the CQI of the terminal, which is less than or equal to a preset width.
  • the maximum value of j is determined according to the segmentation error block rate under the CQI reported by the terminal, whether the segmentation block error rate is less than a preset threshold BLER lQW , and if the determination is yes, j adds a step value otherwise, j does not Change; determine the final MCS based on the value of j.
  • the embodiment of the present invention solves the problem that different terminals in the prior art report different CQIs in the prior art by using the CQI reported by the terminal to calculate different correction values A C3 ⁇ 4.
  • the CQI is used in the embodiment of the present invention.
  • the state is divided into an unstable state and a stable state, two states A different AMC process is used to enable a more accurate selection of the appropriate MCS.
  • the BLER of each MCS under the CQI is counted, and the maximum MCS that satisfies the condition is selected according to the set BLER threshold, thereby enabling the system to be considered.
  • the BLER performance and the maximum throughput performance of the embodiment of the present invention update the BLER of a group of MCSs satisfying the condition according to the reported ACK/NACK when updating the BLER state of the CQI, thereby shortening the time of the initialization process.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

La présente invention se rapporte à un procédé de codage et de modulation adaptatifs. Le procédé selon l'invention comprend les étapes suivantes consistant : à initialiser un paramètre d'indicateur de qualité de voie (CQI, Channel Quality Indicator) correspondant à un CQI rapporté par un terminal sur la base du CQI rapporté par le terminal; à mettre à jour le paramètre CQI correspondant à un accusé de réception (ACK)/non accusé de réception (NACK) sur la base du ACK/NACK rapporté par le terminal; à déterminer le schéma de codage de modulation (MCS, Modulation and Coding Scheme) final sur la base du CQI rapporté par le terminal et du paramètre CQI mis à jour. La présente invention se rapporte d'autre part à un appareil de codage et de modulation adaptatifs. Dans l'appareil selon l'invention, un module de modification de MCS est utilisé pour déterminer le MCS final sur la base du CQI rapporté par le terminal et du paramètre CQI mis à jour. Avec le procédé et le dispositif selon la présente invention, les problèmes rencontrés dans les procédés selon l'état de la technique, au nombre desquels : une irrationalité de la sélection d'un MCS, une baisse des performances de rendement du terminal et une incorrection du taux d'erreur sur les blocs (BLER, Block Error Ratio) cible, qui sont dus à la différence de niveau de capacité des terminaux, à la différence des types de canal et/ou au procédé irrationnel de codage et de modulation adaptatifs, sont résolus.
PCT/CN2010/079400 2010-08-13 2010-12-02 Procédé et appareil de codage et de modulation adaptatifs WO2012019403A1 (fr)

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