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6G移动网络中闪存系统的性能优化方案:比特重映射

方毅 梁旭声 史志芳 韩国军

方毅, 梁旭声, 史志芳, 韩国军. 6G移动网络中闪存系统的性能优化方案:比特重映射[J]. 电子与信息学报, 2022, 44(9): 3083-3090. doi: 10.11999/JEIT220343
引用本文: 方毅, 梁旭声, 史志芳, 韩国军. 6G移动网络中闪存系统的性能优化方案:比特重映射[J]. 电子与信息学报, 2022, 44(9): 3083-3090. doi: 10.11999/JEIT220343
FANG Yi, LIANG Xusheng, SHI Zhifang, HAN Guojun. An Performance Optimization Scheme for Flash Memory System in 6G Mobile Network: Bit Remapping[J]. Journal of Electronics & Information Technology, 2022, 44(9): 3083-3090. doi: 10.11999/JEIT220343
Citation: FANG Yi, LIANG Xusheng, SHI Zhifang, HAN Guojun. An Performance Optimization Scheme for Flash Memory System in 6G Mobile Network: Bit Remapping[J]. Journal of Electronics & Information Technology, 2022, 44(9): 3083-3090. doi: 10.11999/JEIT220343

6G移动网络中闪存系统的性能优化方案:比特重映射

doi: 10.11999/JEIT220343
基金项目: 国家自然科学基金(62071131, U2001203),广东省基础与应用基础研究基金(2022B1515020086)
详细信息
    作者简介:

    方毅:男,教授,研究方向为信息论与信道编码、无线通信、数据存储编码

    梁旭声:男,硕士生,研究方向为数据存储编码

    史志芳:女,硕士生,研究方向为数据存储编码

    韩国军:男,教授,研究方向为信道纠错编码、数据存储、车联网

    通讯作者:

    方毅 fangyi@gdut.edu.cn

  • 中图分类号: TN919

An Performance Optimization Scheme for Flash Memory System in 6G Mobile Network: Bit Remapping

Funds: The National Natural Science Foundation of China (62071131, U2001203), The Guangdong Natural Science Funds for Distinguished Young Scholar (2022B1515020086)
  • 摘要: 第6代移动通信技术(6G)网络所产生的海量数据对数据存储带来了全新挑战,推动着存储技术的迅猛发展。与非门(NAND)闪存存储器具有读写速度快,可靠性高等优点,故在6G网络中具有广泛的应用前景。为了提高NAND闪存的可靠性,针对两种不同位线结构的错误特性,该文分别提出基于全位线结构的等精度重映射方案和基于奇偶位线结构的不等精度的重映射方案。仿真结果表明,两种新型比特重映射方案有效提升了闪存的误码性能。基于此,该文所提重映射技术可被视作6G网络中可靠而高效的存储优化技术。
  • 图  1  MLC闪存信道模型

    图  2  格雷映射下的MLC闪存阈值电压分布

    图  3  两种闪存结构中不同数据的互信息

    图  4  比特重映射方案的实现框架

    图  5  全位线和奇偶位线闪存结构的受干扰示意图

    图  6  全位线结构误码率对比

    图  7  奇偶位线结构误码率对比

    表  1  新型全位线结构重映射方案(算法1)

     输入:原始数据${D_{\text{R}}}$
     输出:重映射后的数据$ D_{\text{R}}' $
     (1) 获取原始数据${D_{\text{R}}}$;
     (2) 将${D_{\text{R}}}$划分成$N$个数据段${S_1},{\text{ }}{S_2},\cdots,{\text{ }}{S_N}$;
     (3) for 数据段${S_n}{\text{ (}}n \in \{ 1,{\text{ }}2,\cdots,{\text{ }}N\} {\text{)}}$ do
     (4)   统计MSB页上1的比例:${R_{{\text{MSB}}}}$;
     (5)   if ${R_{{\text{MSB}}}} < 50\% $,then
     (6)    对MSB页上的数据执行比特翻转操作;
     (7)   分别统计对应MSB页为1和0时LSB页上1的比例:
         ${L^{{\text{MSB = 1}}}},{L^{{\text{MSB = 0}}}}$;
     (8)    if ${L^{{\text{MSB = 1}}}} < 50\% $,then
     (9)    对$ {\text{MSB}} = 1 $对应的LSB页数据执行比特翻转操作;
     (10)   if ${L^{{\text{MSB = 0}}}} > 50\% $,then
     (11)    对$ {\text{MSB}} = 0 $对应的LSB页数据执行比特翻转操作;
     (12)   记录标志位
     (13) end
     (14) 输出重映射后的数据$ D_{\text{R}}' $;
     (15) 结束
    下载: 导出CSV

    表  2  新型奇偶位线结构重映射方案(算法2)

     输入:原始数据${D_{\text{R}}}$
     输出:重映射后的数据$ D_{\text{R}}' $
     (1) 获取原始数据${D_{\text{R}}}$,其中偶单元中的数据为$ D_{\text{R}}^{{\text{even}}} $,奇单元的
       数据为$ D_{\text{R}}^{{\text{odd}}} $;
     (2) 将$ D_{\text{R}}^{{\text{even}}} $划分成$N$个数据段:$S_1^{{\text{even}}},{\text{ }}S_2^{{\text{even}}},\cdots,{\text{ }}S_N^{{\text{even}}}$,将
       $ D_{\text{R}}^{{\text{odd}}} $划分成$M$ ($ M > N $)个数据段$S_1^{{\text{odd}}},{\text{ }}S_2^{{\text{odd}}},\cdots,{\text{ }}S_M^{{\text{odd}}}$;
     (3) for $ S_n^{{\text{even}}}{\text{ (}}n \in \{ 1,{\text{ }}2,\cdots,{\text{ }}N\} ) $ do
     (4)  统计MSB页上1的比例$M_n^{{\text{even}}}$;
     (5)  if $M_n^{{\text{even}}} < 50\% $,then
     (6)   对MSB页数据执行比特翻转操作;
     (7)  统计对应MSB页为1和0时LSB页上1的比例
       ${L^{{\text{MSB = 1}}}},{L^{{\text{MSB = 0}}}}$
     (8)  if ${L^{{\text{MSB = 1}}}} < 50\% $,then
     (9)   对$ {\text{MSB = 1}} $对应的LSB页数据执行比特翻转操作;
     (10)  if ${L^{{\text{MSB = 0}}}} > 50\% $,then
     (11)   对$ {\text{MSB = 0}} $对应的LSB页数据执行比特翻转操作;
     (12)  记录标志位
     (13) end
     (14) for $S_m^{{\text{odd}}}{\text{ (}}m \in \{ 1,{\text{ }}2,\cdots,{\text{ }}M\} )$ do
     (15)  统计MSB页上1的比例$M_m^{{\text{odd}}}$;
     (16)  if $M_m^{{\text{odd}}} < 50\% $,then
     (17)   对MSB页数据执行比特翻转操作;
     (18)  统计对应MSB页为1和0时LSB页上1的比例
        ${L^{{\text{MSB = 1}}}},{L^{{\text{MSB = 0}}}}$
     (19)  if ${L^{{\text{MSB = 1}}}} < 50\% $,then
     (20)   对$ {\text{MSB = 1}} $对应的LSB页数据执行比特翻转操作;
     (21)  if ${L^{{\text{MSB = 0}}}} > 50\% $,then
     (22)   对$ {\text{MSB = 0}} $对应的LSB页数据执行比特翻转操作;
     (23)  记录标志位
     (24) end
     (25) 输出重映射后的数据$ D_{\text{R}}' $;
     (26) 结束
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-03-30
  • 修回日期:  2022-06-20
  • 网络出版日期:  2022-06-29
  • 刊出日期:  2022-09-19

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