WO2012171199A1 - 误块率估计方法及通信设备 - Google Patents

误块率估计方法及通信设备 Download PDF

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Publication number
WO2012171199A1
WO2012171199A1 PCT/CN2011/075804 CN2011075804W WO2012171199A1 WO 2012171199 A1 WO2012171199 A1 WO 2012171199A1 CN 2011075804 W CN2011075804 W CN 2011075804W WO 2012171199 A1 WO2012171199 A1 WO 2012171199A1
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WIPO (PCT)
Prior art keywords
decoding
coded
block
correct
blocks
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Ceased
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PCT/CN2011/075804
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English (en)
French (fr)
Inventor
熊杰
魏岳军
金莹
朱佥
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to JP2014515025A priority Critical patent/JP5759624B2/ja
Priority to PCT/CN2011/075804 priority patent/WO2012171199A1/zh
Priority to CN2011800008559A priority patent/CN102265541B/zh
Priority to EP11867811.9A priority patent/EP2712108B1/en
Publication of WO2012171199A1 publication Critical patent/WO2012171199A1/zh
Priority to US14/104,578 priority patent/US9378085B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a block error rate estimation method and a communication device.
  • the Turbo code is generally used to encode the data service information with a large block length.
  • the Turbo code is used as an error correction code, and often with a Cyclic Redundancy Check (CRC) error detection code.
  • CRC Cyclic Redundancy Check
  • the cascading coding is performed, and the receiving end can obtain whether the error correction code is decoded correctly by using the CRC check result.
  • the Media Access Control (MAC) layer sends a Transport Block (TB) to the physical layer (PHY); usually, the TB is large, which is disadvantageous for the physical layer to encode, as shown in the figure.
  • the physical layer first forms a CRC encoding for the TB and appends the TB-CRC (the portion filled in by the cross lines in la and lb) to the end of the TB data, and then divides the TB into multiple coding blocks ( CB, Code Block), and each Turbo is individually turbo encoded.
  • the physical layer decodes the received data, and checks the TB-CRC, and according to the verification result, it is known whether the decoding of the TB is correct; and the Radio Resource Management (RRM) layer needs The packet error ratio (PER) or short-term (such as tens of milliseconds) block error ratio (BLER) is obtained by the physical layer for decoding, thereby estimating the short-term channel quality or adjusting the power control strategy.
  • PER packet error ratio
  • BLER block error ratio
  • the processing method of the physical layer of the transmitting end to the CB divided by the TB is as follows: As shown in FIG. 1a, the physical layer can directly perform turbo encoding on the divided CB; as shown in FIG. The physical layer may first perform CRC encoding on each of the divided CBs to form a cyclic redundancy check (CB-CRC) of the coded block, and add a CB-CRC (portion filled in dots as shown in FIG. 1b) to the end of each CB data. Then, Turbo coding is performed for each CB.
  • CB-CRC cyclic redundancy check
  • the transmitting end directly encodes the CB
  • the receiving end can only know whether the decoding of the received data is correct according to the TB-CRC check, so that the RRM layer can only know the BLER of the transport block, but in some applications, such as power.
  • the embodiment of the invention provides a block error rate estimation method and a communication device, and improves the accuracy of estimating the block error rate at the receiving end.
  • An aspect of the present invention provides a method for estimating a block error rate, including:
  • the preset strategy includes: when a sum of absolute values of the plurality of APPs is greater than or If the threshold is equal to the preset threshold, the decoding is correct;
  • a decoding error block rate is obtained based on whether the decoding of the N coded coded blocks is correct.
  • An aspect of the present invention provides another method for estimating a block error rate, including:
  • a ratio of a sum of absolute values of the APPs to a sum of absolute values of the plurality of LLRs is greater than or equal to a preset threshold The value is decoded correctly;
  • a decoding error block rate is obtained based on whether the decoding of the N coded coded blocks is correct.
  • Another aspect of the present invention provides a communication device, including:
  • a first decoding unit configured to decode the received N coded coding blocks to obtain a plurality of posterior probabilities APP, where N is a natural number greater than one;
  • the first decoding result obtaining unit includes: decoding correctly when the sum of the absolute values of the multiple APPs is greater than or equal to a preset threshold value And a first error block rate obtaining unit, configured to obtain a decoding error block rate according to whether the decoding of the N coded coded blocks is correct.
  • Another aspect of the present invention provides another communication device, including:
  • a second decoding unit configured to decode, by using a plurality of log likelihood ratio LLRs corresponding to each of the received coded coding blocks, to obtain a plurality of posterior probabilities APP, where N is greater than 1.
  • a second decoding result obtaining unit configured to obtain, according to the plurality of posterior probabilities APP of the second decoding unit, the plurality of log likelihood ratio LLRs, and a preset strategy, to correctly decode or decode the coded blocks after coding If the code is incorrect, the preset strategy includes: when the ratio of the sum of the absolute values of the multiple APPs to the sum of the absolute values of the plurality of LLRs is greater than or equal to the preset threshold value, the decoding is correct;
  • the second error block rate obtaining unit is configured to obtain a decoding error block rate according to whether the decoding of the N coded coded blocks is correct.
  • the receiving end decodes the N coded coded blocks to obtain multiple APPs, and obtains each coded code according to the multiple APPs and a preset policy. Whether the block decoding is correct, and obtaining a decoding error block rate according to whether the decoding of the N coded coding blocks is correct, wherein the preset strategy includes: when the sum of the absolute values of the multiple APPs is greater than or equal to the pre- The decoded value is correctly decoded.
  • the RRM layer of the receiving end can estimate the error block rate, that is, the BLER according to the relevant parameters of the encoded CB, so that the short-time encoding is performed in the tens of milliseconds.
  • the number of blocks is large, so that the receiving end estimates the BLER with more samples and is more accurate.
  • 1a is a schematic structural diagram of processing a coding block in the prior art
  • Figure lb is a schematic structural diagram of another processing of a coding block in the prior art.
  • FIG. 2 is a flowchart of a method for estimating a block error rate according to an embodiment of the method of the present invention
  • FIG. 3 is a flowchart of another method for estimating a block error rate according to an embodiment of the method of the present invention
  • FIG. 4 is an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of another communication device according to an embodiment of the present invention.
  • a method for estimating a block error rate is a method performed by a communication receiving end, and the flowchart is as shown in FIG. 2, and includes:
  • Step 101 Decode the received N coded code blocks to obtain multiple posterior probabilities (A).
  • N is a natural number greater than 1
  • the CB when the physical layer of the transmitting end encodes the CB divided by the TB, the CB can be directly turbo encoded according to the LA, and the encoded coded block is sent to the receiving end; or as shown in FIG. First, each CB is CRC-coded to form a CB-CRC, and the obtained CB-CRC is appended to each corresponding CB data tail, and then each CB is Turbo-encoded, and the encoded coded block is sent to the receiving end.
  • the physical layer of the receiving end receives the encoded CB, and can select N coded CBs, for example, select N coded CBs received within a short time (such as tens of milliseconds), or select long time (such as several hundred milliseconds) to receive. N coded after CB.
  • the physical layer of the receiving end first demodulates the Log-Likelihood Ratio (LLR) corresponding to the encoded CB, and performs Turbo on the multiple LLRs. Decoding, you will get multiple APPs.
  • LLR Log-Likelihood Ratio
  • Step 102 Obtain a result of correctly decoding or incorrectly decoding the coded coded block according to the multiple a posteriori probability APP and the preset policy.
  • the preset strategy here includes: when the sum of the absolute values of the multiple APPs If the decoding is correct when the threshold is greater than or equal to the preset threshold, the decoding error is performed if the sum of the absolute values of the multiple APPs is less than the preset threshold.
  • the preset threshold value here is stored in advance at the receiving end and may be different depending on the actual communication channel.
  • the receiving end needs to obtain the result of correct decoding of the CB corresponding to each coded C in the CB by a preset strategy. Specifically, it is assumed that after decoding an LLR of a coded CB to obtain M APPs, the receiving end first adds the absolute values of the M APPs, and compares the added value with a preset threshold. If the added value is greater than or equal to the preset threshold, the receiving end decodes the encoded CB correctly. If the added value is less than the preset threshold, the receiving end decodes the encoded CB incorrectly. .
  • Step 103 Acquire a decoding error block according to whether the decoding of the N coded coding blocks is correct. Rate.
  • the RRM layer of the receiving end may obtain the decoded block error rate by comparing the number of coded blocks that are decoded incorrectly obtained in step 102 with N. Assuming that the decoding process of the C coded CBs is not correct in the decoding process of the N coded CBs by the receiving end, the decoding error block rate is ⁇ / ⁇ ⁇ 100%.
  • the receiving end decodes the N coded coded blocks to obtain multiple APPs, and obtains each code according to the multiple APPs and a preset policy. Whether the decoding of the post-coded block is correct, and obtaining a decoded block error rate according to whether the decoding of the N coded block is correct, wherein the preset strategy includes: when the sum of the absolute values of the multiple APPs is greater than or The decoding is correct when it is equal to the preset threshold. In this way, when the transmitting end directly encodes the CB according to the method shown in FIG.
  • the RRM layer of the receiving end can estimate the error block rate, that is, the BLER according to the relevant parameters of the encoded CB, so that the short-time encoding is performed in the tens of milliseconds.
  • the number of blocks is large, so that the receiving end estimates the BLER with more samples and is more accurate.
  • the embodiment of the present invention further provides another method for estimating a block error rate.
  • the method in this embodiment is a method performed by a communication receiving end.
  • the flowchart is as shown in FIG. 3, and includes:
  • Step 201 Decode a plurality of log likelihood ratios LLR corresponding to each coded code in the received N coded code blocks to obtain a plurality of posterior probabilities APP, where N is a natural number greater than 1.
  • the CB when the physical layer of the transmitting end encodes the CB divided by the TB, the CB can be directly turbo encoded, and the encoded coded block is sent to the receiving end; or the CB can be formed by performing CRC encoding on each CB first.
  • the CRC adds the obtained CB-CRC to each corresponding CB data tail, and performs Turbo coding on each CB, and obtains the encoded code block and sends it to the receiving end.
  • the physical layer of the receiving end receives the encoded CB, and can select N coded CBs, for example, select N coded CBs received within a short time (such as tens of milliseconds), or select long time (such as several hundred milliseconds) to receive. N coded after CB.
  • the physical layer of the receiving end first demodulates the LLRs corresponding to the encoded CB, and performs Turbo decoding on the multiple LLRs to obtain multiple APPs.
  • Step 202 According to a plurality of posterior probabilities APP, a plurality of log likelihood ratio LLRs, and a preset strategy: when a ratio of a sum of absolute values of the plurality of APPs to a sum of absolute values of the plurality of LLRs is greater than or equal to a pre- If the threshold is set correctly, if the sum of the absolute values of multiple APPs and the absolute value of multiple LLRs If the ratio of the sum is less than the preset threshold, the decoding error.
  • the preset threshold value here is stored in advance at the receiving end, and may be different depending on the actual communication channel.
  • the receiving end needs to obtain the result of correct decoding of the CB corresponding to each coded C in the CB by a preset strategy. Specifically, after decoding the H LLRs of one encoded CB to obtain H APPs, the receiving end first obtains a ratio of the sum of the absolute values of the H APPs to the sum of the absolute values of the H LLRs, and The ratio is compared with a preset threshold. If the ratio is greater than or equal to the preset threshold, the receiving end decodes the encoded CB correctly. If the ratio is less than the preset threshold, the receiving end is The decoding of the CB after the encoding is incorrect.
  • Step 203 Acquire a decoding error block rate according to whether the decoding of the N coded code blocks is correct.
  • the RRM layer of the receiving end may obtain the decoded block error rate by comparing the number of coded blocks that are decoded incorrectly obtained in step 202 with N. Assuming that the decoding process of the C coded CBs is not correct in the decoding process of the N coded CBs by the receiving end, the decoding error block rate is ⁇ / ⁇ ⁇ 100%.
  • the receiving end decodes multiple LLRs of each coded block in the N coded blocks to obtain multiple APPs.
  • the preset policies in which the APP, the multiple LLRs, and the preset policies obtain the correct decoding of the encoded blocks are: The ratio of the sum of the absolute values of the multiple APPs to the sum of the absolute values of the plurality of LLRs
  • the decoding is correct when it is greater than or equal to the preset threshold. In this way, when the transmitting end directly encodes the CB according to the method shown in FIG.
  • the RRM layer of the receiving end can estimate the error block rate, that is, the BLER according to the relevant parameters of the encoded CB, so that the short-time encoding is performed in the tens of milliseconds.
  • the number of blocks is large, so that the receiver estimates
  • the transmitting end performs CRC encoding on the CB to form a CB-CRC according to the method shown in FIG. 1b, and adds the CB-CRC to the end of the CB data, and then encodes the CB
  • the receiving end The method of the embodiment of the present invention can also be used to estimate the block error rate, and the accuracy of the estimated block error rate can be ensured.
  • the error block rate estimated by the method of the embodiment of the present invention is recorded as Quot_Instant-BLER, and the error block rate estimated by CB-CRC according to the existing method is recorded as CRC_Instant-BLER, and their labels are marked.
  • FIG. 4 A schematic diagram of a communication device according to an embodiment of the present invention is shown in FIG. 4, including: a first decoding unit 10, configured to decode the received coded coded blocks to obtain multiple posterior probabilities. , ⁇ is a natural number greater than 1;
  • the first decoding result obtaining unit 11 is configured to obtain, according to the multiple a posteriori probabilities obtained by the first decoding unit 10 and the preset policy, a result of correctly decoding or incorrectly decoding the encoded blocks.
  • the preset strategy here includes: when the sum of the absolute values of the plurality of ⁇ is greater than or equal to the preset threshold, the decoding is correct;
  • the first error block rate obtaining unit 12 is configured to obtain a decoding error block rate according to whether the decoding of the one coded coded block obtained by the first decoding result obtaining unit 11 is correct.
  • the first block error rate obtaining unit 12 may obtain the decoded block error rate by using the first ratio obtaining unit 112, where the first ratio obtaining unit 112 is configured to decode the incorrect encoding. The number of coded blocks is compared to the ⁇ to obtain the decoded block error rate.
  • the first translation acquisition unit 11 obtains the correct result of decoding each coded block according to the plurality of frames and the preset policy.
  • Obtaining a decoding error block rate wherein the preset strategy comprises: decoding when the sum of the absolute values of the plurality of ⁇ is greater than or equal to a preset threshold.
  • Another communication device provided by the embodiment of the present invention is as shown in FIG. 5, and includes: a second decoding unit 20, configured to perform, for each of the received N coded coded blocks, each coded coded corresponding multiple Log likelihood ratio LLR, decoding to obtain multiple posterior probabilities APP, N is a natural number greater than 1;
  • a second decoding result obtaining unit 21, configured to use multiple posterior probabilities according to the second decoding unit 20
  • the APP, the multiple log likelihood ratio LLR, and the preset strategy result in incorrect decoding or incorrect decoding of each encoded coded block.
  • the preset strategies here include: When the sum of the absolute values of multiple APPs The decoding is correct when the ratio of the sum of the absolute values of the plurality of LLRs is greater than or equal to the preset threshold value;
  • the second block error rate obtaining unit 22 is configured to obtain a decoded block error rate according to a result of whether the decoding of the N coded code blocks acquired by the second decoding result acquiring unit 21 is correct.
  • the second block error rate obtaining unit 22 may obtain the decoded block error rate by using the second ratio obtaining unit 122, where the second ratio obtaining unit 122 is configured to decode the incorrect encoding. The number of coded blocks is compared to the N to obtain the decoded block error rate.
  • the second decoding unit 20 decodes the plurality of LLRs of each of the coded blocks in the N coded blocks.
  • a plurality of APPs, and the second decoding result obtaining unit 21 obtains, according to the plurality of APPs, the plurality of LLRs, and the preset policy, whether the decoding of each coded block is correct, and obtains the second block rate.
  • the preset strategy includes: decoding is correct when the ratio of the sum of the absolute values of the plurality of APPs to the sum of the absolute values of the plurality of LLRs is greater than or equal to a preset threshold.
  • the RRM layer of the receiving end can estimate the error block rate, that is, the BLER according to the relevant parameters of the encoded CB, so that the short-time encoding is performed in the tens of milliseconds.
  • the number of blocks is large, so that the receiving end estimates the BLER with more samples and is more accurate.
  • the first and second of the first and second decoding units, the decoding result obtaining unit, the error block rate obtaining unit, and the second ratio obtaining unit described above are not expressed in order, but are used to distinguish different units.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD, etc.

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Abstract

一种误块率估计方法和通信设备，应用于通信技术领域。其中误块率估计方法包括：对接收的N个编码后编码块进行译码分别得到多个后验概率（101），N为大于1的自然数；根据多个后验概率及预设的策略得到对各个编码后编码块的译码正确或译码不正确的结果（102），预设的策略包括：当多个后验概率的绝对值之和大于或等于预设的门限值时译码结果正确；根据N个编码后编码块的译码是否正确的结果，获取译码误块率（103）。实现了译码误块率的估计。

Description

误块率估计方法及通信设备
技术领域
本发明涉及通信技术领域， 特别涉及误块率估计方法及通信设备。
背景技术
现有的通信系统中一般釆用 Turbo码来对块长较大的数据业务信息进行 编码， Turbo码作为一种纠错码，常与循环冗余校验（ Cyclic Redundancy Check, CRC )检错码进行级联编码， 接收端通过 CRC校验结果可获知纠错码译码是 否正确。
具体地， 在发送端， 介质访问控制 （Media Access Control, MAC )层将 传输块（Transport Block, TB )下发至物理层（ PHY ); 通常 TB较大， 不利于 物理层进行编码， 如图 la和 lb所示， 物理层会先对 TB进行 CRC编码形成 并把 TB-CRC (如图 la和 lb中交叉线填充的部分 ) 附加在 TB数据尾部， 再 将 TB分割为多个编码块 (CB, Code Block),并对每个 CB进行单独 Turbo编码。
在接收端， 物理层会对接收的数据进行译码， 并对 TB-CRC进行校验，根 据校验结果获知该 TB 的译码是否正确； 且无线资源管理 （Radio Resource Management, RRM )层需要获知物理层进行译码的误包率（ packet Error Ratio, PER )或短时（如几十毫秒）误块率（Block Error Ratio, BLER ), 从而估计短 时信道质量或调整功控策略等。
在现有技术中， 发送端的物理层对由 TB分割成的 CB的处理方法有如下 两种： 如图 la所示， 物理层可以直接把分割后的 CB进行 Turbo编码； 如图 lb所示， 物理层可以先对分割后的每个 CB进行 CRC编码形成编码块的循环 冗余校验 ( CB-CRC ), 将得到 CB-CRC (如图 lb中点填充的部分） 附加在各 个 CB数据尾部， 再对每个 CB进行 Turbo编码。
如果发送端直接对 CB进行编码，使得接收端只能根据 TB-CRC校验获知 对接收数据的译码是否正确， 从而 RRM层只能获知传输块的 BLER, 但是由 于在有些应用中， 比如功率控制中需要在几十毫秒输出一次 BLER, 而几十毫 秒级的短时内传输块的数量在几十个左右， 使得接收端估计 BLER 时釆样点 少， 不精确。 发明内容
本发明实施例提供误块率估计方法及通信设备，提高接收端估算误块率的 精确度。
本发明一方面提供一种误块率估计方法， 包括：
对接收的 N个编码后编码块进行译码分别得到多个后验概率 APP, N为 大于 1的自然数；
根据该多个后验概率 APP及预设的策略得到对各个编码后编码块的译码 正确或译码不正确的结果， 其中预设的策略包括： 当多个 APP的绝对值之和 大于或等于预设的门限值时译码正确；
根据 N个编码后编码块的译码是否正确的结果， 获取译码误块率。
本发明一方面提供另一种误块率估计方法， 包括：
对接收的 N 个编码后编码块中每个编码后编码对应的多个对数似然比 LLR, 进行译码得到多个后验概率 APP, N为大于 1的自然数；
根据该多个后验概率 APP、 多个对数似然比 LLR及预设的策略得到对各 个 APP的绝对值之和与多个 LLR的绝对值之和的比值大于或等于预设的门限 值时译码正确；
根据 N个编码后编码块的译码是否正确的结果， 获取译码误块率。
本发明另一方面提供一种通信设备， 包括：
第一译码单元， 用于对接收的 N个编码后编码块进行译码分别得到多个 后验概率 APP, N为大于 1的自然数；
第一译码结果获取单元，用于根据第一译码单元得到的多个后验概率 APP 的策略包括： 当多个 APP的绝对值之和大于或等于预设的门限值时译码正确； 第一误块率获取单元， 用于根据 N个编码后编码块的译码是否正确的结 果， 获取译码误块率。
本发明另一方面提供另一种通信设备， 包括：
第二译码单元， 用于对接收的 N个编码后编码块中每个编码后编码对应 的多个对数似然比 LLR, 进行译码得到多个后验概率 APP, N为大于 1的自 然数；
第二译码结果获取单元，用于根据第二译码单元的多个后验概率 APP、多 个对数似然比 LLR及预设的策略得到对各个编码后编码块的译码正确或译码 不正确的结果， 预设的策略包括： 当多个 APP的绝对值之和与多个 LLR的绝 对值之和的比值大于或等于预设的门限值时译码正确；
第二误块率获取单元， 用于根据 N个编码后编码块的译码是否正确的结 果， 获取译码误块率。
本发明实施例中， 接收端在接收到编码后编码块后， 对其中 N个编码后 编码块进行译码分别得到多个 APP, 根据这多个 APP及预设的策略得到对各 个编码后编码块译码是否正确的结果， 并根据 N个编码后编码块的译码是否 正确的结果， 获取译码误块率， 其中预设策略包括： 当多个 APP的绝对值之 和大于或等于预设的门限值时译码正确。 这样当发送端按照如图 la所示的方 法直接对 CB进行编码时， 接收端的 RRM层可以根据编码后 CB的相关参数 来估计误块率即 BLER, 这样在几十毫秒级的短时内编码块的数量较多， 使得 接收端估计 BLER时釆样点较多， 比较精确。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地， 下面描述 中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲， 在不付 出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1 a是现有技术中一种对编码块进行处理的结构示意图；
图 lb是现有技术中另一种对编码块进行处理的结构示意图；
图 2是本发明方法实施例提供的一种误块率估计方法的流程图； 图 3是本发明方法实施例提供的另一种误块率估计方法的流程图； 图 4是本发明实施例提供的一种通信设备的结构示意图；
图 5是本发明实施例提供的另一种通信设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例提供的一种误块率估计方法，本实施例的方法是通信接收端 执行的方法， 流程图如图 2所示， 包括：
步骤 101 , 对接收的 N个编码后编码块进行译码分别得到多个后验概率（ A
Posteriori Probability, APP ), 其中 N是大于 1的自然数；
可以理解， 发送端的物理层在对由 TB分割成的 CB进行编码时， 可以如 图 la所示， 直接对 CB进行 Turbo编码， 得到编码后编码块发送给接收端； 也可以如图 lb所示， 先对每个 CB进行 CRC编码形成 CB-CRC, 将得到的 CB-CRC附加到各个相应的 CB数据尾部， 再对每个 CB进行 Turbo编码， 得 到编码后编码块发送给接收端。
这样接收端的物理层接收到编码后 CB, 可以选取 N个编码后 CB, 比如 选择短时 (如几十毫秒）内接收的 N个编码后 CB, 或选择长时 (如几百毫秒） 内接收的 N个编码后 CB。 在对每个编码后 CB进行译码时， 接收端的物理层 会先解调得到编码后 CB对应的多个对数似然比（ Log-Likelihood Ratio, LLR ), 并对这多个 LLR进行 Turbo译码， 会得到多个 APP。
步骤 102,根据多个后验概率 APP及预设的策略得到对各个编码后编码块 的译码正确或译码不正确的结果， 这里预设的策略包括： 当多个 APP的绝对 值之和大于或等于预设的门限值时译码正确， 则如果多个 APP的绝对值之和 小于预设的门限值则译码错误。
这里预设的门限值是预先储存在接收端的 ,可以根据实际通信信道的不同 而不同。
接收端需要通过预设的策略得到 N个编码后 CB中每个编码后 CB对应的 译码正确与否的结果。 具体地， 假设对一个编码后 CB的 LLR进行译码后得 到 M个 APP, 则接收端先将 M个 APP的绝对值相加， 并将该相加值与预设 的门限进行比较， 如果相加值大于或等于预设的门限值， 则接收端对该编码后 CB的译码正确， 如果相加值小于预设的门限值， 则接收端对该编码后 CB的 译码不正确。
步骤 103 , 根据 N个编码后编码块的译码是否正确的结果， 获取译码误块 率。
在获取译码误块率时， 接收端的 RRM层可以将步骤 102得到的译码不正确 的编码后编码块数量与 N相比得到译码误块率。假设接收端对 N个编码后 CB的 译码过程中， 有 P个编码后 CB的译码不正确， 则译码误块率为 Ρ/Ν χ 100%。
可见， 本发明实施例中， 接收端在接收到编码后编码块后， 对其中 N个编 码后编码块进行译码分别得到多个 APP, 根据这多个 APP及预设的策略得到对 各个编码后编码块译码是否正确的结果， 并根据 N个编码后编码块的译码是否 正确的结果， 获取译码误块率， 其中预设策略包括： 当多个 APP的绝对值之和 大于或等于预设的门限值时译码正确。这样当发送端按照如图 la所示的方法直 接对 CB进行编码时，接收端的 RRM层可以根据编码后 CB的相关参数来估计误 块率即 BLER, 这样在几十毫秒级的短时内编码块的数量较多， 使得接收端估 计 BLER时釆样点较多 , 比较精确。
本发明实施例还提供另一种误块率估计方法，本实施例的方法是通信接收 端执行的方法， 流程图如图 3所示， 包括：
步骤 201 , 对接收的 N个编码后编码块中每个编码后编码对应的多个对数 似然比 LLR, 进行译码得到多个后验概率 APP, 其中 N为大于 1的自然数；
可以理解， 发送端的物理层在对由 TB分割成的 CB进行编码时， 可以直 接对 CB进行 Turbo编码， 得到编码后编码块发送给接收端； 也可以先对每个 CB进行 CRC编码形成 CB-CRC,将得到的 CB-CRC附加到各个相应的 CB数 据尾部， 再对每个 CB进行 Turbo编码， 得到编码后编码块发送给接收端。
这样接收端的物理层接收到编码后 CB, 可以选取 N个编码后 CB, 比如 选择短时 (如几十毫秒）内接收的 N个编码后 CB, 或选择长时 (如几百毫秒） 内接收的 N个编码后 CB。 在对每个编码后 CB进行译码时， 接收端的物理层 会先解调得到编码后 CB对应的多个 LLR, 并对这多个 LLR进行 Turbo译码， 会得到多个 APP。
步骤 202, 根据多个后验概率 APP、 多个对数似然比 LLR及预设的策略 括： 当多个 APP的绝对值之和与多个 LLR的绝对值之和的比值大于或等于预 设的门限值时译码正确， 则如果多个 APP的绝对值之和与多个 LLR的绝对值 之和的比值小于预设的门限值则译码错误。
这里预设的门限值是预先储存在接收端的，可以根据实际通信信道的不同 而不同。
接收端需要通过预设的策略得到 N个编码后 CB中每个编码后 CB对应的 译码正确与否的结果。 具体地， 4艮设对一个编码后 CB的 H个 LLR进行译码 后得到 H个 APP, 则接收端先得到 H个 APP的绝对值之和与 H个 LLR的绝 对值之和的比值， 并将该比值与预设的门限进行比较，如果比值大于或等于预 设的门限值， 则接收端对该编码后 CB的译码正确， 如果比值小于预设的门限 值， 则接收端对该编码后 CB的译码不正确。
步骤 203 , 根据 N个编码后编码块的译码是否正确的结果， 获取译码误块 率。
在获取译码误块率时， 接收端的 RRM层可以将步骤 202得到的译码不正确 的编码后编码块数量与 N相比得到译码误块率。假设接收端对 N个编码后 CB的 译码过程中， 有 P个编码后 CB的译码不正确， 则译码误块率为 Ρ/Ν χ 100%。
可见， 本发明实施例中， 接收端在接收到编码后编码块后， 对其中 N个编 码后编码块中每个编码后编码块的多个 LLR, 进行译码得到多个 APP, 根据这 多个 APP、 多个 LLR及预设的策略得到对各个编码后编码块的译码是否正确的 中预设策略包括： 当多个 APP的绝对值之和与多个 LLR的绝对值之和的比值大 于或等于预设的门限值时译码正确。这样当发送端按照如图 la所示的方法直接 对 CB进行编码时，接收端的 RRM层可以根据编码后 CB的相关参数来估计误块 率即 BLER, 这样在几十毫秒级的短时内编码块的数量较多， 使得接收端估计
BLER时釆样点较多， 比较精确。
在一个具体的实施例中， 如果发送端按照如图 lb所示的方法先对 CB进行 CRC编码形成 CB-CRC, 将 CB-CRC附加加在 CB数据尾部， 再对 CB进行编码， 则接收端也可以用本发明实施例的方法进行误块率的估计，且能保证估计的误 块率的精度。
殳设釆用本发明实施例的方法估计的误块率记为 Quot— Instant— BLER, 而 按照现有方法通过 CB-CRC估计的误块率记为 CRC— Instant— BLER,则它们的标 准差 σ ：
Figure imgf000008_0001
其中， N为 CB的数量， 如果 CB的长度 K=5114, 码率 （ CR ) 为 0.6, 预设的门 限值为 7.6, 则在加性高斯白噪声 （Additive White Gaussian Noise, AWGN )信 道和典型市区（ Typical Urban, TU ) 30衰落信道下估计的短时误块率的标准差 如表 1所示：
表 1 在 AWGN信道下 在 TU30信道下 信噪比 （ SNR ) σ SNR σ
5dB 1.45 10-2 4dB 1.32 10"2
6dB 1.32 10"2 5dB 1.36 x 10-2
7dB 1.17 10-2 6dB 1.16 x 10-2
8dB 9.44 10"3 7dB 1.01 10-2
9dB 7.81 10-3 8dB 7.93 10-3 lOdB 5.96 10-3 9dB 4.83 10"3 lldB 4.53 10"3 9.5dB 4.01 10"3 总体 1.019 x 10-2 总体 8.258 10-3 由表 1可知由于标准差值 σ很小， 使得釆用本发明实施例的方法估计的误 块率与釆用 CB-CRC估计的误块率相别很小， 这样釆用本发明实施例的方法进 行估计的误块率准确性很高。
本发明实施例提供的一种通信设备， 结构示意图如图 4所示， 包括： 第一译码单元 10, 用于对接收的 Ν个编码后编码块进行译码分别得到多 个后验概率 ΑΡΡ, Ν为大于 1的自然数；
第一译码结果获取单元 11 , 用于根据第一译码单元 10得到的多个后验概 率 ΑΡΡ及预设的策略得到对各个编码后编码块的译码正确或译码不正确的结 果， 这里预设的策略包括： 当多个 ΑΡΡ的绝对值之和大于或等于预设的门限 值时译码正确；
第一误块率获取单元 12,用于根据第一译码结果获取单元 11获取的 Ν个 编码后编码块的译码是否正确的结果， 获取译码误块率。
在一个具体的实施例中， 第一误块率获取单元 12可以通过第一比值获取 单元 112来获取译码误块率， 其中， 第一比值获取单元 112用于将译码不正确 的编码后编码块数量与所述 Ν相比得到所述译码误块率。
本发明实施例的通信设备中，通信设备在接收到编码后编码块后， 第一译 获取单元 11根据这多个 ΑΡΡ及预设的策略得到对各个编码后编码块的译码是 正确的结果， 获取译码误块率， 其中预设策略包括： 当多个 ΑΡΡ的绝对值之和 大于或等于预设的门限值时译码正确。这样当发送端按照如图 la所示的方法直 接对 CB进行编码时，接收端的 RRM层可以根据编码后 CB的相关参数来估计误 块率即 BLER, 这样在几十毫秒级的短时内编码块的数量较多， 使得接收端估 计 BLER时釆样点较多 , 比较精确。 本发明实施例提供的另一种通信设备， 结构示意图如图 5所示， 包括： 第二译码单元 20, 用于对接收的 N个编码后编码块中每个编码后编码对 应的多个对数似然比 LLR, 进行译码得到多个后验概率 APP, N为大于 1的 自然数；
第二译码结果获取单元 21 , 用于根据第二译码单元 20 的多个后验概率 APP、 多个对数似然比 LLR及预设的策略得到对各个编码后编码块的译码正 确或译码不正确的结果， 这里预设的策略包括： 当多个 APP的绝对值之和与 多个 LLR的绝对值之和的比值大于或等于预设的门限值时译码正确；
第二误块率获取单元 22,用于根据第二译码结果获取单元 21获取的 N个 编码后编码块的译码是否正确的结果， 获取译码误块率。
在一个具体的实施例中， 第二误块率获取单元 22可以通过第二比值获取 单元 122来获取译码误块率， 其中， 第二比值获取单元 122用于将译码不正确 的编码后编码块数量与所述 N相比得到所述译码误块率。
本发明实施例的通信设备中，通信设备在接收到编码后编码块后， 第二译 码单元 20对其中 N个编码后编码块中每个编码后编码块的多个 LLR,进行译 码得到多个 APP,第二译码结果获取单元 21根据这多个 APP、多个 LLR及预 设的策略得到对各个编码后编码块的译码是否正确的结果，并由第二误块率获 其中预设策略包括： 当多个 APP的绝对值之和与多个 LLR的绝对值之和的比 值大于或等于预设的门限值时译码正确。 这样当发送端按照如图 la所示的方 法直接对 CB进行编码时， 接收端的 RRM层可以根据编码后 CB的相关参数 来估计误块率即 BLER, 这样在几十毫秒级的短时内编码块的数量较多， 使得 接收端估计 BLER时釆样点较多， 比较精确。
上述所说的第一和第二译码单元、译码结果获取单元、误块率获取单元和 第二比值获取单元中第一和第二并不是表述顺序关系，而是为了区分不同的单 元。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读 存储介质中， 存储介质可以包括： ROM、 RAM, 磁盘或光盘等。
以上对本发明实施例所提供的误块率估计方法及通信设备，进行了详细介 例的说明只是用于帮助理解本发明的方法及其核心思想； 同时，对于本领域的 一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变 之处， 综上所述， 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种误块率估计方法， 其特征在于， 包括：
对接收的 N个编码后编码块进行译码分别得到多个后验概率 APP, 所述 N为大于 1的自然数；
根据所述多个后验概率 APP及预设的策略得到对各个编码后编码块的译 码正确或译码不正确的结果， 所述预置的策略包括： 当所述多个 APP的绝对 值之和大于或等于预设的门限值时译码正确；
2、 如权利要求 1所述的方法， 其特征在于， 根据所述 N个编码后编码块 的译码是否正确的结果， 获取译码误块率具体包括：
将所述译码不正确的编码后编码块数量与所述 N相比得到所述译码误块 率。
3、 一种误块率估计方法， 其特征在于， 包括：
对接收的 N 个编码后编码块中每个编码后编码对应的多个对数似然比 LLR, 进行译码得到多个后验概率 APP, 所述 N为大于 1的自然数；
根据所述多个后验概率 APP、 多个对数似然比 LLR及预设的策略得到对 所述多个 APP的绝对值之和与所述多个 LLR的绝对值之和的比值大于或等于 预设的门限值时译码正确；
4、 如权利要求 3所述的方法， 其特征在于， 根据所述 N个编码后编码块 的译码是否正确的结果， 获取译码误块率具体包括：
将所述译码不正确的编码后编码块数量与所述 N相比得到所述译码误块 率。
5、 一种通信设备， 其特征在于， 包括：
第一译码单元， 用于对接收的 N个编码后编码块进行译码分别得到多个 后验概率 APP, 所述 N为大于 1的自然数；
第一译码结果获取单元，用于根据所述第一译码单元得到的多个后验概率 所述预设的策略包括： 当所述多个 APP的绝对值之和大于或等于预设的门限 值时译码正确；
第一误块率获取单元， 用于根据所述 N个编码后编码块的译码是否正确 的结果， 获取译码误块率。
6、 如权利要求 4或 5所述的通信设备， 其特征在于， 所述第一误块率获 取单元具体包括第一比值获取单元，用于将所述译码不正确的编码后编码块数 量与所述 N相比得到所述译码误块率。
7、 一种通信设备， 其特征在于， 包括：
第二译码单元， 用于对接收的 N个编码后编码块中每个编码后编码对应 的多个对数似然比 LLR, 进行译码得到多个后验概率 APP, 所述 N为大于 1 的自然数；
第二译码结果获取单元， 用于根据所述第二译码单元的多个后验概率 APP、 多个对数似然比 LLR及预设的策略得到对各个编码后编码块的译码正 确或译码不正确的结果， 所述预设的策略包括： 当所述多个 APP的绝对值之 和与所述多个 LLR 的绝对值之和的比值大于或等于预设的门限值时译码正 确；
第二误块率获取单元， 用于根据所述 N个编码后编码块的译码是否正确 的结果， 获取译码误块率。
8、 如权利要求 7所述的通信设备， 其特征在于， 所述第二误块率获取单 元具体包括第二比值获取单元，用于将所述译码不正确的编码后编码块数量与 所述 N相比得到所述译码误块率。
PCT/CN2011/075804 2011-06-16 2011-06-16 误块率估计方法及通信设备 Ceased WO2012171199A1 (zh)

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