CN202887175U - 缓冲储存装置的控制器 - Google Patents

缓冲储存装置的控制器 Download PDF

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CN202887175U
CN202887175U CN201220370164XU CN201220370164U CN202887175U CN 202887175 U CN202887175 U CN 202887175U CN 201220370164X U CN201220370164X U CN 201220370164XU CN 201220370164 U CN201220370164 U CN 201220370164U CN 202887175 U CN202887175 U CN 202887175U
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storage device
buffer storage
controller
wireless signal
code block
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傅永生
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MediaTek Inc
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CHEN SI ELECTRONICS TECHNOLOGY (SHANGHAI) Co Ltd
MStar Semiconductor Inc Taiwan
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/63—Joint error correction and other techniques
    • H03M13/6306—Error control coding in combination with Automatic Repeat reQuest [ARQ] and diversity transmission, e.g. coding schemes for the multiple transmission of the same information or the transmission of incremental redundancy
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining

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  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Detection And Prevention Of Errors In Transmission (AREA)
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Abstract

本实用新型提供了一种缓冲储存装置的控制器，可应用于长程演进计划(LTE)无线接收器，其包含有一侦测单元，用以侦测LTE无线讯号中的码块(CB)；一分配单元，依据所侦测到码块来分配一缓冲储存装置以产生一分配结果；以及一存取单元，依据该分配结果将该LTE无线讯号中部份数据写入该缓冲储存装置。本实用新型所提供缓冲储存装置的控制器，基于CB块对缓冲储存装置进行分割，并进行动态分配，以提升缓冲储存装置的使用效率，并大幅降低缓冲储存装置所需的容量。

Description

缓冲储存装置的控制器
技术领域
本实用新型涉及缓冲储存装置的控制技术，特别涉及应用于长程演进计划(LTE)无线接收器的缓冲储存装置的控制器。 
背景技术
长程演进计划(Long Term Evolution，LTE)通讯协议在物理层引入混合自动重传请求机制(Hybrid Automatic Repeat Request,harq）进行差错控制，对于下行用户终端(UE侧)来说，当第一次传输不能正确译码时，需要开辟缓冲储存装置来存储相应的软比特，以便和未来重传的比特进行合并而获得增益。 
现有技术并无特别规划该缓冲储存装置，来储存的这些软比特，以至于需要一大容量的缓冲储存装置来达到储存目的，而大容量的缓冲储存装置将造成成本大幅的增加。 
实用新型内容
有鉴于此，本实用新型的目的之一在于提供缓冲储存装置的控制器，基于码块(code block，CB)对缓冲储存装置进行分割，并进行动态分配，以提升缓冲储存装置的使用效率，并大幅降低缓冲储存装置所需的容量，以解决上述问题。 
本说明书提供了一种缓冲储存装置的控制器，可应用于LTE无线接收器，其包含有一侦测单元，用以侦测LTE无线讯号中的CB；一分配单元，依据所侦测到码块来分配一缓冲储存装置以产生一分配结果；以及一存取单元，依据该分配结果将该LTE无线讯号中部份数据写入该缓冲储存装置。 
区别于现有技术的情况，本实用新型所提供的缓冲储存装置的控制 器基于CB对缓冲储存装置进行分割，并进行动态分配，以提升缓冲储存装置的使用效率，并大幅降低缓冲储存装置所需的容量。 
附图说明
图1为本实用新型的缓冲储存装置的控制器的方块示意图； 
图2为传统方式中CB所需缓冲储存装置空间示意图； 
图3为本实用新型CB所需缓冲储存装置空间示意图； 
图4为以对循环缓冲储存装置存取三次操作示意图； 
图5为缓冲储存装置经2次储存后的储存状况示意图； 
图6为缓冲储存装置经3次储存后的合并情况示意图。 
具体实施方式
LTE协议定义了5种用户终端类型，每种用户终端类型memory可以存储的软比特数量如下表所示： 
表1 
用户终端类型 总的软比特数目（NIR）
Category1 250368
Category2 1237248
Category3 1237248
Category4 1827072
Category5 3667200
LTE协议规定了每个传输块(transmission block，TB)混合自动重传请求机制(harq)所需的缓冲储存装置缓冲储存装置的大小和可以存储的传输块的数目，由下列的公式确定： 
Figure DEST_PATH_GDA00002704440600021
其中：Nsoft为表1所规定的大小。 
Mlimit为8的常数，MDL_HARQ为下行最大harq进程的数目，其取值依赖于TDD UL/DL配置，如表2所示。 
表2 
TDD UL/DL配置 MDL_HARQ
0 4
1 7
2 10
3 9
4 12
5 15
6 6
也即用户终端把harq缓冲储存装置最多分成8个部分。实际中如果TDD UL/DL配置为5，即最大harq进程的数目为15的时候，就会出现需要存储错误码字却没有缓冲储存装置可用的情况。 
考虑到LTE中每个codeword码字都包含1-13个CB，每个CB都有自己的CRC用来检测本CB是否正确译码，因此会出现一些CB被正确译码，另外一些CB错误的情况。如果按照TB来分配缓冲储存装置的话，这些被正确译码的CB也会占据宝贵的缓冲储存装置。 
为了充分利用缓冲储存装置，如果将缓冲储存装置按照CB进行平均分割，存储错误的CB，将使缓冲储存装置利用率大大提高。请参考图1，其系本实用新型提出一种缓冲储存装置的控制器的方块示意图。本实用新型的缓冲储存装置的控制器100包含有一侦测单元110，一分配单元120，以及一存取单元130。侦测单元110自收发器140接收LTE无线讯号，并侦测LTE无线讯号中的CB。在一较佳实施例中，侦测单元110系侦测TB中错误的CB。分配单元120依据所侦测到码块来分配缓冲储存装置200以产生一分配结果。存取单元130依据该分配结果将该LTE无线讯号中部份数据写入该缓冲储存装置200。在一较佳实施例中，存取单元130仅将错误的CB存入缓冲储存装置。缓冲储存装置的控制器100基于CB对缓冲储存装置200进行分割，并进行动态分配，以提升缓冲储存装置200的使用效率，并大幅降低缓冲储存装置200所需的容量。 
由于实际传输中属于不同TB的CB大小不同,和NIR相似的方法，在以CB进行缓冲储存装置分配时也必须支持最大的CB。但是如果按照最大CB来分配缓冲储存装置的话，基于CB的方法，能够存储的总的CB的个数将少于基于TB的方案中CB的个数。这样基于CB的方案将不会有好的性能。 
举个例子：Category3可存储的总信道比特为1237248，如果TDDUL/DL config=5,且Kmimo=1，那么NIR＝154656，总共可以存储8*13=104个CB。如果使用基于CB的方案，每个CB需要的缓冲储存装置大小为3*6144＝18432，总共可以存储67个CB。 
为解决上述出现的问题，若增加可用的CB个数，就必须减少存储每个CB的缓冲储存装置的大小。假设CB的大小为KW，那么传统的方法是对每个CB开的缓冲储存装置为3*KW大小，如图2所示，实际上我们可以减少缓冲储存装置的大小，例如对于系统比特缓冲储存装置大小为KW，而校验比特大小为KW/2，则可以表示为图3。这样每个CB的缓冲储存装置大小为2*KW大小，这样就节省了1/3的空间。 
实际中，如果一个CB经过3次传输，那么每次缓冲储存装置的存储方法如图4所示。经过2次存储，用户终端中的缓冲储存装置变成如图5所示。图中灰色为第一次存储的软比特，而黑色为第二次存储的比特。在上面的第二次传输中，假设RV=3，那么其在循环缓冲储存装置中对应的位置应该在图4中的后段，但是由于缓冲储存装置只有KW/2，因此我们需要把它挪到前面，并把两次存储的比特对应的循环缓冲储存装置的起始地址记录下来，以便未来进行合并，好进行速率匹配。当第三次传输来到后，在缓冲储存装置中的合并情况如图6所示，尽管缓冲储存装置没有开3*KW大小，但是并没有丢弃任何软比特，因此没有任何性能损失。 
总上所述，本实用新型所提出的缓冲储存装置的控制器具有下列特色： 
（1）基于CB对缓冲储存装置进行分割，并进行动态分配，充分利用了错误TB中译码正确的CB。 
（2）对于系统比特，开给完全缓冲储存装置大小，对于校验比特减少缓冲储存装置大小，不论实际重传CB传输起始于虚拟循环缓冲储存装置何处，记录其地址，并连续存储缓冲储存装置中，实际合并时读入到芯片内的缓冲储存装置中。 
（3）本实用新型的思想也可以应用在FDD-LTE(频分双工LTE)中来减少缓冲储存装置的大小。 
以上所述仅为本实用新型的较佳实施例，凡依本实用新型申请专利范围所做的均等变化与修饰，皆应属本实用新型的涵盖范围。 

Claims (4)

1.一种缓冲储存装置的控制器，应用于长程演进计划无线接收器，其包含有 
一侦测单元，用以侦测长程演进计划无线讯号中的码块； 
一分配单元，依据所侦测到码块来分配一缓冲储存装置以产生一分配结果；以及 
一存取单元，依据该分配结果将该长程演进计划无线讯号中部份数据存入该缓冲储存装置。 
2.如权利要求1所述的缓冲储存装置的控制器，其中，该侦测单元用以侦测该长程演进计划无线讯号中各传输块中的码块。 
3.如权利要求1所述的缓冲储存装置的控制器，其中，该分配单元系依据侦测单元的侦测结果，动态分配该缓冲储存装置的储存空间。 
4.如权利要求1所述的缓冲储存装置的控制器，其中，该存取单元将各传输块中错误的码块存入该缓冲储存装置。 
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