WO2012146020A1 - 自适应调制与编码方法及装置 - Google Patents

自适应调制与编码方法及装置 Download PDF

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Publication number
WO2012146020A1
WO2012146020A1 PCT/CN2011/081684 CN2011081684W WO2012146020A1 WO 2012146020 A1 WO2012146020 A1 WO 2012146020A1 CN 2011081684 W CN2011081684 W CN 2011081684W WO 2012146020 A1 WO2012146020 A1 WO 2012146020A1
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Prior art keywords
mcs
current
sinr
bler
condition
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PCT/CN2011/081684
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English (en)
French (fr)
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张庆宏
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中兴通讯股份有限公司
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Publication of WO2012146020A1 publication Critical patent/WO2012146020A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H04L1/0021Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an adaptive modulation and coding method and apparatus. Background technique
  • the wireless communication system since the wireless channel is complex and variable, and there is no fixed change rule to follow; in order to realize reliable and efficient data transmission in the wireless communication system, it is desirable that the wireless communication system can automatically adjust according to the condition of the channel condition.
  • the transmission rate is adapted to the change of the wireless channel, ie AMC technology.
  • the existing AMC Adaptive Modulation and Coding
  • SINR Signal to Interference and Noise Ratio
  • MCS Modulation Coding Scheme
  • SINR Signal to Interference and Noise Ratio
  • the link emulation channel is always different from the channel experienced by the actual signal, the difference is usually the BLER (Block Error Rate), the number of transport blocks failed to be transmitted within a certain number of transmissions divided by the total number of transport blocks.
  • BLER Block Error Rate
  • the statistic is used to correct the mapping table between SINR and MCS. If the BLER is less than or less than the target BLER set by the system, the system meets the reliability requirement, otherwise the system fails to meet the reliability requirement.
  • the BLER sensitivity is as high as possible, that is, the shortest statistical window length needs to be selected, but the statistical window length is long.
  • the statistical accuracy of the BLER will be shortened, and the accuracy of BLER will be reduced, which will inevitably lead to the transmission reliability of the system cannot be guaranteed.
  • the present invention is directed to an adaptive modulation and coding method and apparatus for solving the problem that the existing adaptive modulation coding method cannot adapt to the rapid change of the wireless channel and ensure the reliability of the system.
  • the present invention provides an adaptive modulation and coding method, including:
  • the number of transport blocks c T , FaU and the total number of transport blocks c s of the current transmission failure are obtained within a predetermined statistical window length ⁇ ;
  • the MCS used for this data transmission is selected according to the current O e te Mw .
  • the step of determining whether the current BLER reaches the BLER Tai . get includes: determining according to the following two conditions:
  • condition 1 it is determined that the current BLER of the wireless link is greater than the BLER Target ; if the condition 1 is not met but the condition 2 is met, it is determined that the current BLER of the wireless link is less than the BLER Target ; if both conditions are not met, Then do not process;
  • condition one is: C namFail ⁇ BLER T * W Tmns ⁇ C Mait ⁇ BLER T * W nans
  • condition two is: C nans ⁇ W nms C nms > W T where [ ⁇ ] indicates multiplication.
  • step of selecting the MCS used for the current data transmission according to the current Z ⁇ te Mw includes:
  • the MCS for data transmission is selected by adjusting the SINR with te Mwi , and the MCS with the SINR equal to SINR plus the current Z ⁇ Zto ⁇ p is looked up in the SINR and MCS mapping table.
  • Step is a real number
  • the MCS for data transmission is selected by adjusting the MCS with te Mwi , and the mapping table of the SINR and the MCS is searched according to the SINR, and the MCS obtained by the lookup table is added to the current DeZto as the present.
  • the MCS of the secondary data transmission if the MCS is greater than the MCS max, the current data transmission is sent by using the MCS max. If the MCS is smaller than the MCS0, the current data transmission is sent by using the MCS0, where Step is an integer.
  • the method further includes: initializing C T réelle s and C T ′ ⁇ as initial values, and resetting C rauß s and C rauß sFaa to initial values after the current judgment is completed, and continuing to the total value
  • the transport block and the data block that failed to be transmitted are counted.
  • the invention also provides an adaptive modulation and coding device, comprising:
  • a counting module configured to acquire, for a wireless link, a number of transport blocks C rauß sFaa and a total number of transport blocks that are currently failed to be transmitted within a predetermined statistical window length;
  • a mapping adjustment module configured to determine , according to C amFail , C Tmm and a block error rate target value BLER Ta et, whether the current BLER of the wireless link reaches a BLER Target , and obtain a channel signal to interference and noise ratio (SINR) and a modulation and coding mode MCS according to the judgment result.
  • the selection module is used to select the MCS used for this data transmission according to the current Delta. Further, the mapping adjustment module specifically includes:
  • a determining unit configured to determine, according to C TmnsFail , C Trans and a block error rate target value BLER Target Whether the current BLER of the line link reaches the BLER Target :
  • condition one it is determined that the current BLER of the wireless link is greater than the BLER Target ; if the condition 1 is not met but the condition 2 is met, determining that the current BLER of the wireless link is less than
  • condition one C TmnsFail ⁇ BLE ⁇ W Tmns C TmnsFail ⁇ BLER T W Tr condition
  • the adjusting unit is configured to determine, according to the judgment result obtained by the judging unit, the adjustment relationship between the SINR and the MCS: if the condition one is satisfied, the Z3 ⁇ 4 to Mw is updated as z3 ⁇ 4Zto Mwi + ⁇ p as the current Ddm Mappiache g ; if the condition 1 is not satisfied But if condition 2 is met, update Ddm Mappi facile g to
  • the selecting module is specifically configured to: if Z ⁇ Zto Mwi is used as the correction amount of the SINR, the MCS for data transmission is selected by adjusting the SINR with Oete Mwi) , the selection module is at the SINR and the MCS.
  • mapping table look up the MCS with the SINR equal to the SINR plus the current Ddm Mapping , as the MCS used for the data transmission, where Step is a real number; if De ⁇ Mapp ⁇ is used as the correction amount of the MCS, select the MCS by adjusting the MCS with te Mw For the current MCS for data transmission, the selection module searches the mapping table of the SINR and the MCS according to the SINR, and adds the MCS obtained by the lookup table to the MCS of the current data transmission, if the MCS is greater than
  • MCS max transmits this data transmission using MCS max. If the MCS is smaller than MCS0, the current data transmission is sent by MCS0, where Step is an integer.
  • C T Volunteer s and C T s sFmi are initialized to initial values, and the counting module is further configured to reset ⁇ and ( ⁇ ⁇ to an initial value and continue to the total transmission after the current judgment is completed. Blocks and data blocks that failed to be transferred are counted.
  • the invention solves the problem that the existing adaptive modulation coding method can not adapt to the rapid change of the wireless channel and ensures the reliability of the system by adding an adjustment relationship between the SINR and the MCS mapping relationship, and improves the communication efficiency and communication reliability of the wireless communication.
  • FIG. 1 is a schematic flow chart of a first method embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a second method embodiment of the present invention.
  • FIG. 3 is a schematic structural view of an embodiment of a device of the present invention. detailed description
  • FIG. 1 is a schematic flowchart of a first method embodiment, which may specifically include: Step 101: Parameter definition and initialization;
  • a transmission number counter for a wireless link, a transmission number counter, a transmission failure number counter, and an SINR and MCS mapping relationship adjustment amount Z toMwi are defined ; wherein the transmission number counter is used for the total number of transmission transmission blocks. Counting, the total number of transmission blocks is recorded as C T transmission failure number counter is used to count the number of transmission blocks that failed to be transmitted, and the number of transmission blocks that failed to be transmitted is recorded as C Raven sFaa , above C rraiW , C —
  • Step 102 Start counting;
  • the total number of transmission blocks is recorded by the number of transmission counters, that is, if a transmission block is transmitted on the link, C rra toast s is automatically incremented by 1;
  • the failure count counter records the number of transmission blocks that failed to be sent, that is, if one transmission block fails to be sent on the link, C nansFail is automatically incremented by one.
  • Step 103 Obtain a current mapping relationship adjustment amount
  • Step is a real number, indicating D e / w , butAdjust the step size, where Step>0, Step The smaller the absolute value, the more accurate the adjustment but the slower the adjustment speed. Otherwise, the larger the absolute value of Step, the faster the adjustment but the adjustment accuracy. Reduced.
  • Step 104 Select the MCS used for the data transmission according to the SINR and MCS mapping table and the current ⁇ to ⁇ ;
  • the mapping between the SINR and the MCS is searched according to the SINR+current Z ⁇ to Mw , that is, the MCS with the SINR equal to the SINR+the current Ddta ng is searched in the SINR and MCS mapping table, as the MCS used in the current transmission.
  • FIG. 2 is a schematic flowchart of a second method embodiment, which may specifically include: Step 201: Parameter definition and initialization;
  • a transmission number counter for a wireless link, a transmission number counter, a transmission failure number counter, and an SINR and MCS mapping relationship adjustment amount Te M i are defined;
  • the transmission number counter is used to count the total number of transmission transmission blocks, and the total number of transmission transmission blocks is recorded as a C T transmission failure number counter for counting the number of transmission blocks that failed to be transmitted, and the transmission failure is transmitted.
  • the number of blocks is denoted as C Cincinnati sFaa , and the above C rraiW , C amFail v Delta Mappi plausible g are initial ⁇ ⁇ is o.
  • the total number of transmission blocks is recorded by the number of transmission counters, that is, if a transmission block is transmitted on the link, C ⁇ s is automatically incremented by 1;
  • the number counter records the number of transmission blocks that failed to be sent, that is, if one transmission block on the link fails to transmit, C Canal sFaa is automatically incremented by one.
  • Step 203 Obtain the current mapping relationship adjustment amount
  • Step is an integer, indicating the adjustment step of O e /to M i , where Step>0, the smaller the absolute value of Step, the more accurate the adjustment but the slower the adjustment speed. Otherwise, the larger the absolute value of Step, the faster the adjustment but the adjustment is accurate. The degree has been reduced.
  • Step 204 Select, according to the SINR and MCS mapping table and the current Z ⁇ te ⁇ , the MCS used for the current data transmission;
  • the SINR is used to search the mapping table of the SINR and the MCS, and the MCS obtained by the lookup table is added to the current ⁇ as the MCS of the current transmission. If the MCS is greater than the MCS, This transmission is sent by MCS, if it is smaller than MCS. Then the transmission uses MCS. send.
  • MCS MCS.
  • MCS ⁇ represents the highest order MCS MCS
  • ⁇ MCS i+l 0 ⁇ i ⁇ max-1
  • SINR and MCS mapping tables are shown in Table 1 below:
  • FIG. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention, which may specifically include: a counting module, a mapping adjustment module, and a selection module;
  • a counting module for a wireless link, obtains the number of transmission blocks C rauß s and the total number of transmission blocks in the current statistical window length; C Tmm and C—initialize to an initial value, The counting module is further configured to reset c and C Tm s sFaii to an initial value after the current judgment is completed, and continue to count the total transport block and the data block that failed to be transmitted.
  • mapping adjustment module specifically includes: a determining unit and an adjusting unit, where
  • condition one it is determined that the current BLER of the wireless link is greater than the BLER Target ; if the condition 1 is not met but the condition 2 is met, determining that the current BLER of the wireless link is less than BLER Target ; If both conditions are not met, no processing is performed;
  • condition one C nansFail ⁇ BLER T ⁇ C nmsFail ⁇ BLER T condition>.
  • the adjusting unit determines the adjustment relationship between the SINR and the MCS according to the judgment result obtained by the determining unit: if the condition one is satisfied, the Z ⁇ te Mw is updated as Z ⁇ te ⁇ + ⁇ as the current Delta Mapping ; if the condition is not satisfied Once the condition 2 is satisfied, the Ddta Mapping is updated as the current te MiW. If both conditions are not satisfied, then te Mwi is the current Z ⁇ Zt ⁇ ; where Step is an integer or a real number, indicating that the SINR and MCS mapping relationship is adjusted.
  • the adjustment step size is an integer or a real number, indicating that the SINR and MCS mapping relationship is adjusted.
  • the selection module is specifically used to use Z ⁇ te Mwi as the correction amount of SINR.
  • the amount of correction of the MCS is selected by adjusting the MCS with Z ⁇ Zto Mw to select the data transmission.
  • the MCS the selection module searches the mapping table of the SINR and the MCS according to the SINR, and adds the MCS obtained by the lookup table to the ZMS e Zto Mw as the MCS of the current data transmission. If the MCS is greater than the MCS max, the data transmission is performed. MCS max sends, if the MCS is smaller than MCS0, the current data transmission is sent by MCS0, where Step is an integer, MCSmax represents the highest order MCS, and MCS0 represents the lowest order MCS.
  • the embodiments of the present invention provide an adaptive modulation and coding method and apparatus. According to the variation characteristics of the wireless channel, the existing adaptive modulation and coding method cannot be solved by adding an adjustment relationship between the SINR and the MCS mapping relationship. Adapting to the rapid change of the wireless channel and ensuring the reliability of the system, the communication efficiency of the wireless communication and the communication reliability are improved.
  • the above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims. Industrial applicability
  • the invention solves the problem that the existing adaptive modulation coding method can not adapt to the rapid change of the wireless channel and ensures the reliability of the system by adding an adjustment relationship between the SINR and the MCS mapping relationship, and improves the communication efficiency and communication reliability of the wireless communication.

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Abstract

本发明公开了一种自适应调制与编码方法及装置,本发明通过增加一个SINR与MCS映射关系调整量,解决了现有自适应调制编码方法无法适应无线信道的快速变化和保证系统可靠性的问题,提高了无线通信的通信效率和通信可靠性。

Description

自适应调制与编码方法及装置 技术领域
本发明涉及通信技术领域, 尤其涉及一种自适应调制与编码方法及装 置。 背景技术
在无线通信系统中, 由于无线信道复杂多变, 且无固定的变化规律可 循; 为了在无线通信系统中, 实现数据可靠和高效传输, 就希望无线通信 系统能够根据信道条件的条件变自动调整传输速率以适应无线信道的变 化, 即 AMC技术。
现有的 AMC ( Adaptive Modulation and Coding, 适应性调变与编码 ) 方法, 通常是根据 SINR ( Signal to Interference and Noise Ratio, 信道信干噪 比)测量结果, 查找 SINR与 MCS ( Modulation Coding Scheme, 调制编码 方式) 映射表(此表通常通过链路级仿真给出), 找到对应的 MCS。
由于链路仿真信道总是与实际信号经历的信道存在差异, 该差异通常 是通过 BLER ( Block Error Rate, 误块率, 一定传输次数内传输失败的传输 块个数除以总的传输块个数之商)统计来校正 SINR与 MCS之间的映射表, 如果 BLER小于或者小于等于系统设定的目标 BLER,则系统满足可靠性要 求, 否则 系统就未能满足可靠性要求。
BLER统计中统计时间越长越准确,但 BLER灵敏性也越差, 为了适应 瞬息万变的无线信道就需要尽可能高的 BLER灵敏性, 即需要选择尽可能 短的统计窗长, 然而统计窗长的缩短必将降氏 BLER的统计准确性, BLER 准确性降低又必将导致系统的传输可靠性无法保障。
以上问题使得现有的 AMC 方法无法适应信道的快速变化和保障系统 的可靠通信。 发明内容
鉴于上述的分析, 本发明旨在提供一种自适应调制与编码方法及装置, 用于解决现有自适应调制编码方法无法适应无线信道的快速变化和保证系 统可靠性的问题。
本发明的目的主要是通过以下技术方案实现的:
本发明提供了一种自适应调制与编码方法, 包括:
对一条无线链路, 在预定的统计窗长^ 内获取当前传输失败的传输 块个数 cT,FaU和总的传输块个数 c s
根据 .∞s 、 ^∞5和误块率目标值 BLERTarget判断该无线链路的当前 BLER是否达到 BLERTa et, 并根据判断结果获得信道信干噪比 SINR与调 制编码方式 MCS当前映射关系调整量 Oe toMwi)¾
根据当前 OeteMw 选择本次数据传输所用的 MCS。
进一步地, 判断当前 BLER是否达到 BLERTai.get的步驟具体包括: 根据以下两个条件进行判断:
如果满足条件一, 则判定该该无线链路的当前 BLER大于 BLERTarget; 如果不满足条件一但满足条件二, 则判定该无线链路的当前 BLER 小于 BLERTarget; 如果两个条件均不满足, 则不做处理;
其中, 条件一为: CnamFail≥ BLERT * WTmns ^ CMait≥ BLERT * Wnans 条 件二为: Cnans≥Wnms Cnms > WT 其中 [·]表示相乘。
进一步地, 根据判断结果获得当前 ZtoMw 的步驟具体包括: 如果满足条件一,则更新 DeltaMappig = DeltaMapping + Step作为当前 DeltaMapping; 如果不满足条件一但满足条件二, 则更新当前 /to^ : /^^^^ - ·¾ 作 为当前 Z)e/t¾w 如果两个条件均不满足, 则 Z^toMiWi 作为当前 Z¾ZtoMw 其中, Step为整数或者为实数, 表示 SINR与 MCS映射关系调整量 的调整步长。
进一步地,根据当前 Z^teMw 选择本次数据传输所用的 MCS的步驟具 体包括:
如果把 Z^toMwi 作为 SINR的校正量,通过用 teMwi 调整 SINR来选 择本次数据传输用的 MCS, 则在 SINR与 MCS映射表中查找 SINR等于 SINR加当前 Z^Zto^p 的 MCS,作为本次数据传输采用的 MCS,其中, Step 为实数;
如果把 Z^toMw 作为 MCS的校正量, 通过用 teMwi 调整 MCS来选 择本次数据传输用的 MCS, 则根据 SINR查找 SINR与 MCS的映射表, 将 查表得到的 MCS 加上当前 DeZto 作为本次数据传输的 MCS,若该 MCS 大于 MCS max则本次数据传输采用 MCS max发送,若该 MCS小于 MCS0 则本次数据传输采用 MCS0发送, 其中, Step为整数。
进一步地, 所述方法还包括: CTs和 CT „^初始化为初始值, 当本次判 断完成后,将 C ras和 C rasFaa复位为初始值,并继续对总的传输块和传输失败 的数据块进行计数。
本发明还提供了一种自适应调制与编码装置, 包括:
计数模块, 用于对一条无线链路, 在预定的统计窗长内获取当前传输 失败的传输块个数 C rasFaa和总的传输块个数 ;
映射调整模块, 用于根据 C amFail、 CTmm和误块率目标值 BLERTa et判断 该无线链路的当前 BLER是否达到 BLERTarget, 并根据判断结果获得信道信 干噪比 SINR与调制编码方式 MCS的当前映射关系调整量 Z^Zto^^;
选择模块, 用于根据当前 Delta 选择本次数据传输所用的 MCS。 进一步地, 所述映射调整模块具体包括:
判断单元, 用于根据 CTmnsFail、 CTrans和误块率目标值 BLERTarget判断该无 线链路的当前 BLER是否达到 BLERTarget:
如果满足条件一, 则判定该该无线链路的当前 BLER大于 BLERTarget; 如果不满足条件一但满足条件二, 则判定该无线链路的当前 BLER 小于
BLERTarget; 如果两个条件均不满足, 则不做处理;
其中, 条件一: CTmnsFail≥ BLE^ WTmns CTmnsFail≥ BLERT WTr 条件
C 或1
调整单元, 用于根据判断单元得出的判断结果确定 SINR与 MCS的映 射关系调整量: 如果满足条件一, 则更新 Z¾ toMw 为 z¾ZtoMwi + ^p作为当 前 DdmMappig; 如果不满足条件一但满足条件二, 则更新 DdmMappig
DeltaMapping— Step作为 食 DdtaMapping 如果两个条件均不满足, 则 OeZtoMw 作 为当前 Z^te ; 其中, Step为实数, 表示 SINR与 MCS映射关系调整量 的调整步长。
进一步地, 所述选择模块具体用于, 如果把 Z^ZtoMwi 作为 SINR的校 正量, 通过用 OeteMwi)¾调整 SINR来选择本次数据传输用的 MCS, 则所述 选择模块在 SINR与 MCS映射表中查找 SINR等于 SINR加当前 DdmMapping的 MCS,作为本次数据传输采用的 MCS,其中, Step为实数;如果把 De^Mapp^ 作为 MCS的校正量, 通过用 teMw 通过调整 MCS来选择本次数据传输 用的 MCS, 则所述选择模块根据 SINR查找 SINR与 MCS的映射表, 将查 表得到的 MCS 加上 Z^Zto^^作为本次数据传输的 MCS, 若该 MCS大于
MCS max则本次数据传输采用 MCS max发送,若该 MCS小于 MCS0则本 次数据传输采用 MCS0发送, 其中, Step为整数。
进一步地, CTs和 CTsFmi初始化为初始值, 所述计数模块还用于, 当本次 判断完成后,将 <^ 和(^ ^复位为初始值,并继续对总的传输块和传输失 败的数据块进行计数。 本发明有益效果如下:
本发明通过增加一个 SINR与 MCS映射关系调整量, 解决了现有自适 应调制编码方法无法适应无线信道的快速变化和保证系统可靠性的问题, 提高了无线通信的通信效率和通信可靠新。
本发明的其他特征和优点将在随后的说明书中阐述, 并且, 部分的从 说明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其 他优点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结 构来实现和获得。 附图说明
图 1为本发明第一方法实施例的流程示意图;
图 2为本发明第二方法实施例的流程示意图;
图 3为本发明装置实施例的结构示意图。 具体实施方式
下面结合附图来具体描述本发明的优选实施例, 其中, 附图构成本申 请一部分, 并与本发明的实施例一起用于阐释本发明的原理。
首先结合附图 1和附图 2对本发明实施例所述方法进行详细说明。 如图 1所示, 图 1为第一方法实施例的流程示意图, 具体可以包括: 步驟 101 : 参数定义及初始化;
具体的说就是, 针对一条无线链路, 定义一个传输次数计数器、 一个 传输失败次数计数器、 一个 SINR与 MCS的映射关系调整量 ZtoMwi ; 其中, 传输次数计数器用于对发送传输块的总个数进行计数, 发送传 输块的总个数记为 CT 传输失败次数计数器用于对发送失败的传输块个 数进行计数, 发送失败的传输块个数记为 C „sFaa , 上述 CrraiW、 C—
DeltaMapping均初始^ ^为 o。 步骤 102: 开始计数;
具体的说就是, 每当有数据传输时, 通过传输次数计数器记录发送传 输块的总个数, 即, 若在该条链路上发送一个传输块, 则 Crras自动加 1; 通 过传输失败次数计数器记录发送失败的传输块个数, 即, 若该条链路上有 一个传输块发送失败, 则 CnansFail自动加 1。
步骤 103: 获得当前映射关系调整量;
具体的说就是, 根据 f„,7s和误块率目标值 BLERTarget判断该无 线链路的当前 BLER是否达到 BLERTarget, 并根据判断结果获得信道信干噪 比 SINR与调制编码方式 MCS当前映射关系调整量 ¾Zr«Mii)i)ig
更进一步的说就是,
设定统计窗长为 WrraiW个传输块, 由于系统可靠性要求为 BLER (误块 率) 小于或者小于等于 (选择小于还是小于等于需要根据系统情况而定) 误块率目标值 SL R ei, 所以, 设定以下两个条件并据此进行判断:
条件一: > BLERT t · WTnms或 C ansFail≥ BLERT^et · WTrans ,
条件 '- CTrans≥ WTrans或 CTrans > WTrans
判断过程包括:先判断 CnansFail≥ BLERTaiget · WTrans或 C msFail≥ BLERT31get · WTrans 是否满足,如果是,判定该无线链路的当前 BLER大于 BLERTarget,则 C amFial 和 C ans 复 位 , 即 C— =Q CTrans =0 , 并 更新 DelmMapping 即 DeltaMapping = Delta + Step作为当前 Dd Mapping; 如果否, 则接着对条件二进 行判断;
判断 c ^ 或 c s >wrras是否满足, 如果是, 判定该无线链路的当 前 BLER小于 BLERTarget, 则 Crra„.sFaa和 .„„s复位, 即 Crra„.sFa =0 Crnm5 =0 , 并 更新 DeltaMapping 即 DdtaMap≠ng = DeltaMapping - Step作为当前 DehaMapping; 如果否, 即 两个条件均不满足, 不作处理, 此时 ^Zto^p 保持不变, 即该 , 作 为当前 )eteMw
其中, Step为实数,表示 De/ w,„ 调整步长,其中 Step〉0, Step绝对值 越小调整越精确但调整速度也越慢, 反之 Step绝对值越大调整越快但调整 精确度有所降低。
步骤 104: 根据 SINR与 MCS映射表和当前 ^to^ 选择本次数据传 输所用的 MCS;
具体的说就是,根据 SINR+当前 Z^toMw 查找 SINR与 MCS的映射表, 即,在 SINR与 MCS映射表中查找 SINR等于 SINR+当前 DdtaM ng的 MCS , 作为本次传输采用的 MCS。
如图 2所示, 图 2为第二方法实施例的流程示意图, 具体可以包括: 步骤 201 : 参数定义及初始化;
具体的说就是, 针对一条无线链路, 定义一个传输次数计数器、 一个 传输失败次数计数器、 一个 SINR与 MCS映射关系调整量 teM i
其中, 传输次数计数器用于对发送传输块的总个数进行计数, 发送传 输块的总个数记为 CT 传输失败次数计数器用于对发送失败的传输块个 数进行计数, 发送失败的传输块个数记为 C „sFaa , 上述 CrraiW、 C amFail v DeltaMappig均初始 ^ ^为 o。 步骤 202: 开始计数
具体的说就是, 每当有数据传输时, 通过传输次数计数器记录发送传 输块的总个数, 即, 若在该条链路上发送一个传输块, 则 C^s自动加 1; 通 过传输失败次数计数器记录发送失败的传输块个数, 即, 若该条链路上有 一个传输块发送失败, 则 C „sFaa自动加 1。
步骤 203: 获得当前映射关系调整量
具体的说就是, 根据 CTransFail、 CT難和误块率目标值 BLERTai.get判断该无 线链路的当前 BLER是否达到 BLERTarget, 并根据判断结果确定信道信干噪 比 SINR与调制编码方式 MCS当前映射关系调整量 /toMwi)¾; 更进一步的说就是,
设, 统计窗长为 Wr,丽个传输块, 由于系统可靠性要求为 BLER (误块 率) 小于等于误块率目标值 SL£:? ,. , 所以, 设定以下两个条件并据此进 行判断:
条件一: - BLERTaIget · WTmm或 CTmmFail≥ BLERj &1 et · WTmns ,
条件二: CTmis≥ WTmns或 C ans > WTrans
判断过程包括:先判断 C ansFail > BLERT3Iget · WTmns或 CT,霍 Fml≥ BLER · WTrans 是否满足, 如果是, 判定该该无线链路的当前 BLER 大于 BLERTarget, 则 CTnmsFial和 CTmns 复位, 即 CTmnsFail = 0 CTram =0 , 并更新 Delta 即 DehaMappmg = Delta Mamng + 作为当前!^ 。^; 如果否, 则接着对条件二进 行判断;
判断 C ^ 或 C s >^ras是否满足, 如果是, 判定该无线链路的当 前 BLER小于 BLERTarget, 则 CrraiKi¾a和 .ns复位, 即 CrrasFn,7 =0 CTrans =0, 并 吏新 DdmM ng 即 De/to^ ^^/ ^ -^^作为当前 to^^; 如果否, 即 两个条件均不满足, 不做处理, 此时 保持不变, 即该 ^^^作 为当前 £>eteMwi)¾
其中, Step为整数, 表示 Oe/toM i 的调整步长, 其中 Step〉0,Step绝对 值越小调整越精确但调整速度也越慢, 反之 Step绝对值越大调整越快但调 整精确度有所降低。
步驟 204: 根据 SINR与 MCS映射表和当前 Z^te^, 选择本次数据传 输所用的 MCS;
具体的说就是, 根据 SINR查找 SINR与 MCS的映射表, 将查表得到 的 MCS 加上当前 ^^^作为本次传输的 MCS,若此 MCS大于 MCS 则 本次传输采用 MCS 发送, 若小于 MCS。则本次传输采用 MCS。发送。
其中 , MCS。表述最低阶 MCS , MCS^表述最高阶 MCS MCS, < MCSi+l,0≤ i≤ max- 1 , SINR与 MCS映射表如下表 1所示:
表 1
Figure imgf000010_0001
以下结合附图 3对本发明实施例所述装置进行详细说明。
如图 3所示, 图 3为本发明装置实施例的结构示意图, 具体可以包括: 计数模块、 映射调整模块、 选择模块; 其中,
(一)计数模块, 对一条无线链路, 在预定的统计窗长内获取当前传输失 败的传输块个数 C ras 和总的传输块个数 ; CTmm和 C—初始化为初始 值, 所述计数模块还用于, 当本次判断完成后, 将 c 和 CTmsFaii复位为初始 值, 并继续对总的传输块和传输失败的数据块进行计数。
(二 ) 映射调整模块, 根据 C— CTrans和误块率目标值 BLERTarget判 断该无线链路的当前 BLER是否达到 BLERTarget, 并根据判断结果获得信道 信干噪比 SINR与调制编码方式 MCS的当前映射关系调整量 ZtoMwi ; 映射调整模块具体包括: 判断单元和调整单元, 其中,
判断单元, 根据 C „sFaa、 ^ 和误块率目标值 BLERTarget判断该无线链 路的当前 BLER是否达到 BLERTarget:
如果满足条件一, 则判定该该无线链路的当前 BLER大于 BLERTarget; 如果不满足条件一但满足条件二, 则判定该无线链路的当前 BLER 小于 BLERTarget; 如果两个条件均不满足, 则不做处理;
其中, 条件一: CnansFail≥ BLERT ^ CnmsFail≥ BLERT 条件 〉 。
调整单元, 根据判断单元得出的判断结果确定 SINR与 MCS的映射关 系调整量: 如果满足条件一, 则更新 Z^teMw 为 Z^te^^ + ^^作为当前 DeltaMapping; 如果不满足条件一但满足条件二, 则更新 DdtaMapping为 作为当前 teMiW 如果两个条件均不满足, 则 teMwi 为当前 Z^Zt^^ ; 其中, Step为整数或者为实数, 表示 SINR与 MCS映射 关系调整量的调整步长。
(三 )选择模块, 根据当前 teMiW 选择本次数据传输所用的 MCS。 选择模块具体用于, 如果把 Z^teMwi 作为 SINR 的校正量, 通过用
DeltaMapping i^ SINR 来选择本次数据传输用的 MCS, 则所述选择模块在
SINR与 MCS映射表中查找 SINR等于 SINR加当前 θ^αΜψρ 的 MCS, 作 为本次数据传输采用的 MCS, 其中, Step 为实数; 如果把 Z^ZtoMwi 作为
MCS的校正量, 通过用 Z^ZtoMw 通过调整 MCS来选择本次数据传输用的
MCS, 则所述选择模块根据 SINR查找 SINR与 MCS的映射表, 将查表得 到的 MCS 加上 Z)eZtoMw 作为本次数据传输的 MCS, 若该 MCS大于 MCS max则本次数据传输采用 MCS max发送, 若该 MCS小于 MCS0则本次数 据传输采用 MCS0发送, 其中, Step为整数, MCSmax表述最高阶 MCS , MCS0表述最低阶 MCS。
综上所述, 本发明实施例提供了一种自适应调制与编码方法及装置, 根据无线信道的变化特性, 通过增加一个 SINR与 MCS映射关系调整量, 解决了现有自适应调制编码方法无法适应无线信道的快速变化和保证系统 可靠性的问题, 提高了无线通信的通信效率和通信可靠新。 以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并 不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本 发明的保护范围应该以权利要求书的保护范围为准。 工业实用性
本发明通过增加一个 SINR与 MCS映射关系调整量, 解决了现有自适 应调制编码方法无法适应无线信道的快速变化和保证系统可靠性的问题, 提高了无线通信的通信效率和通信可靠新。

Claims

权利要求书
1、 一种自适应调制与编码方法, 该方法包括:
对一条无线链路, 在预定的统计窗长 w „s内获取当前传输失败的传^T 块个数 c rasFaa和总的传输块个数 c ras
根据<^„,、 CT 和误块率目标值 BLERTarget判断该无线链路的当前误 块率 BLER是否达到所述 BLERTarget, 并根据判断结果获得信道信干噪比 SINR与调制编码方式 MCS的当前映射关系调整量 ZTOMWI
根据所述当前 Z^t^^ 选择本次数据传输所用的 MCS。
2、 根据权利要求 1 所述的方法, 其中判断当前 BLER 是否达到 BLERTarget的步驟具体包括:
根据以下两个条件进行判断:
如果满足条件一, 则判定该无线链路的当前 BLER大于 BLERTarget; 如 果不满足条件一但满足条件二, 则判定该无线链路的当前 BLER 小于 BLERTarget; 如果两个条件均不满足, 则不做处理;
其中, 条件一: CTmnsFail≥ BLERTarget · WTmns或 C ansFail≥ BLERTarget · WTmns;条件
~ · C 〉 。
3、 根据权利要求 2所述的方法, 其中根据判断结果获得当前
Figure imgf000013_0001
的步驟具体包括:
如果满足条件一,则更新 teMwi)¾ = z)eteMw 作为当前 z^teMw ; 如果不满足条件一但满足条件二, 则更新当前 Z^teMwi = Z)eZtoMw - & 作 为当前 Z)eteMw 如果两个条件均不满足, 则 z¾ toMw 作为当前 Z¾ toMw 其中, Step为实数, 表示 SINR与 MCS映射关系调整量的调整步长。
4、 根据权利要求 3所述的方法, 其中根据当前 /^ 选择本次数据 传输所用的 MCS的步驟具体包括: 如果把 Z^toMwi 作为 SINR的校正量,通过用 teMwi 调整 SINR来选 择本次数据传输用的 MCS, 则在 SINR与 MCS映射表中查找 SINR等于 SINR加当前 Z^Zto^p 的 MCS,作为本次数据传输采用的 MCS,其中, Step 为实数;
如果把 Z^toMw 作为 MCS的校正量, 通过用 teMwi 调整 MCS来选 择本次数据传输用的 MCS, 则根据 SINR查找 SINR与 MCS的映射表, 将 查表得到的 MCS 加上当前 Z^ZtoMw 作为本次数据传输的 MCS,若该 MCS 大于 MCS max则本次数据传输采用 MCS max发送,若该 MCS小于 MCS0 则本次数据传输采用 MCS0发送, 其中, Step为整数, MCSmax表述最高 阶 MCS, MCS0表述最低阶 MCS。
5、根据权利要求 1或 2所述的方法,其中所述方法还包括: Cnam和 C— 初始化为初始值, 当本次判断完成后, 将 ( ^„和( „^„复位为初始值, 并 继续对总的传输块和传输失败的数据块进行计数。
6、 一种自适应调制与编码装置, 该装置包括:
计数模块, 用于对一条无线链路, 在预定的统计窗长内获取当前传输 失败的传输块个数 C rasFaa和总的传输块个数 ;
映射调整模块, 用于根据 C amFail、 CTrans和误块率目标值 BLERTarget判断 该无线链路的当前 BLER是否达到 BLERTarget, 并根据判断结果获得信道信 干噪比 SINR与调制编码方式 MCS的当前映射关系调整量 ZtoMwi
选择模块, 用于根据当前 DdtaMapping选择本次数据传输所用的 MCS。
7、 根据权利要求 6所述的装置, 其中所述映射调整模块具体包括: 判断单元, 用于根据<„,、 s和误块率目标值 BLERTarget判断该无 线链路的当前 BLER是否达到 BLERTarget:
如果满足条件一, 则判定该无线链路的当前 BLER大于 BLERTarget; 如 果不满足条件一但满足条件二, 则判定该无线链路的当前 BLER 小于 BLERTarget; 如果两个条件均不满足, 则不做处理;
其中, 条件一为: CT Fail≥ BLERTarget · WTmns或 C ansFail≥ BLERW · WTmm;条
^牛 J ^为: CTr ≥ 〉
调整单元, 用于根据判断单元得出的判断结果确定 SINR与 MCS的映 射关系调整量: 如果满足条件一, 则更新 Z¾ toMw 为 z¾ZtoMwi + ^p作为当 前 DdmMappig; 如果不满足条件一但满足条件二, 则更新 DdmMappig为 作为当前 teMiW 如果两个条件均不满足, 则 teMwi 为当前 Z^toMw ; 其中, Step为实数, 表示 SINR与 MCS映射关系调整量 的调整步长。
8、 根据权利要求 7所述的装置, 其中所述选择模块具体用于, 如果把
Dd Mapping作为 SINR的校正量,通过用 DelmMapping ijm SINR来选择本次数据 传输用的 MCS, 则所述选择模块在 SINR与 MCS映射表中查找 SINR等于 SINR加当前 Z^Zto^^的 MCS,作为本次数据传输采用的 MCS,其中, Step 为实数; 如果把 Z^teMwi 作为 MCS 的校正量, 通过用 Z¾ZtoMw ^通过调整 MCS来选择本次数据传输用的 MCS ,则所述选择模块根据 SINR查找 SINR 与 MCS的映射表, 将查表得到的 MCS 加上 Z^Zto^^作为本次数据传输的 MCS,若该 MCS大于 MCS max则本次数据传输采用 MCS max发送,若该 MCS小于 MCS0则本次数据传输采用 MCS0发送, 其中, Step为整数。
9、 根据权利要求 6或 7所述的装置, 其中 C „ p C „sFaa初始化为初始 值, 所述计数模块还用于:当本次判断完成后, 将 C 和 CTmsFaii复位为初始 值, 并继续对总的传输块和传输失败的数据块进行计数。
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