LTE自适应技术研究.doc

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1、LTE自适应技术研究目 录LTE自适应技术研究报告11引言91.1编写目的91.2预期读者和阅读建议91.3参考资料91.4缩写术语402技术特征412.1概述412.2基本原理和特点412.2.1自适应技术所需要的信道状态信息412.2.1.1基于信噪比均值的信道状态信息412.2.1.2基于误比特率统计的方法422.2.1.3基于信道矩阵的方法422.2.2典型自适应技术简介423技术研究情况433.1链路自适应433.1.1背景情况433.1.2方案评估433.1.2.1下行433.1.2.1.1RB-dependent还是RB-common？433.1.2.1.1.1RB-depend

2、ent AM443.1.2.1.1.2RB-common AMC443.1.2.1.1.3RB-dependent AMC453.1.2.1.1.4方案比较与结论453.1.2.1.2下行AMC与功率分配的联合考虑463.1.2.2上行483.1.2.2.1TPC实现方案493.1.2.2.2AMC、ATB与TPC的联合考虑503.1.3结论513.2HARQ513.2.1背景情况513.2.2方案评估523.2.2.1HARQ实现方式的确定（同步、异步、自适应、非自适应）523.2.2.2HARQ定时与进程数523.2.2.2.1FDD HARQ543.2.2.2.2TDD HARQ563.

3、2.2.2.2.1下行563.2.2.2.2.2上行623.2.2.3RV定义与取值663.2.2.3.1RV数目663.2.2.3.2RV顺序673.2.2.4星座重排的取舍673.3传输模式自适应683.3.1基本描述683.3.2方案评估683.3.2.1下行传输模式683.3.2.1.1为什么需定义多种传输模式，Mode 1-7？模式之间如何切换？683.3.2.1.2RACH过程下的UE搜索空间与RNTI使用693.3.2.1.3C-RNTI下，为什么Mode 3-7加入了DCI格式1A以支持发射分集？Mode内部的两种格式如何进行切换？733.3.2.1.4SPS C-RNTI下，

4、为什么Mode 3-6仅支持发射分集，不支持MIMO Precoding操作？Mode 内部的两种格式如何进行切换？753.3.2.1.5SPS C-RNTI下，为什么Mode 7使用DCI格式1A时不采用与C-RNTI相同的传输方案（即单天线端口0或发射分集），而采用单天线端口5传输？753.3.2.2上行传输配置753.3.3R8的局限与后续可能的演进783.4频域调度783.4.1背景情况783.4.2方案评估783.4.2.1频域调度的增益783.4.2.2频域的CQI获取793.4.2.3频域调度的策略793.4.3结论793.5CQI压缩与反馈方式793.5.1背景情况793.5.

5、2方案评估803.5.2.1基本CQI反馈方案803.5.2.1.1Average上报（即宽带CQI）803.5.2.1.2Band Average上报（即各子带全上报）803.5.2.1.3best-M individual上报（即选择M个子带上报）803.5.2.1.4best-M average上报803.5.2.1.5Best-M Bitmap上报813.5.2.1.6Differential上报813.5.2.1.7best-M individual+ Differential上报813.5.2.1.8Hierarchical structure上报813.5.2.1.9Non-Co

6、ntiguous Hybrid方案823.5.2.1.10Block Non-Contiguous Hybrid方案833.5.2.1.11DCT-n方案833.5.2.1.12进一步演进与结论833.5.2.1.12.1CQI表格的设计843.5.2.1.12.2Set S subbands定义883.5.2.1.12.3为什么引入nomPDSCH-RS-EPRE-Offset参数？893.5.2.2Wideband feedback893.5.2.2.1为什么不支持PUSCH上报模式Mode 1-0、Mode 1-1？893.5.2.3eNode B Configured Subbands

7、 Feedback on PUSCH893.5.2.3.1为什么引入高层配置的子带上报？893.5.2.3.2子带差分CQI大小893.5.2.3.2.1比特宽度893.5.2.3.2.2差分偏移量取值903.5.2.3.3子带PRB数目取值903.5.2.3.4为什么去除了上报模式3-2?903.5.2.4UE-Selected Subbands Feedback on PUSCH903.5.2.4.1为什么引入UE选择的子带上报？903.5.2.4.2子带差分CQI大小913.5.2.4.3子带PRB数目取值913.5.2.4.4M取值913.5.2.4.5Best-M子带标签编号923.

8、5.2.4.5.1组合法923.5.2.4.5.2Bitmap法923.5.2.4.5.3单独法923.5.2.4.5.4集合法933.5.2.4.5.5结论953.5.2.4.6为什么去除了PUSCH上报模式2-1?953.5.2.5Frequency-selective CQI report on PUCCH953.5.2.5.1子带CQI上报方式953.5.2.5.2子带划分参数取值963.5.2.6MIMO模式下的CQI反馈和PMI上报963.5.2.6.1空间差分CQI963.5.2.6.1.1比特宽度963.5.2.6.1.2开环、闭环的适用性973.5.2.6.2RI973.5.

9、2.6.2.1RI的上报周期973.5.2.6.2.2RI的编码方式983.5.2.6.3PMI983.5.2.6.3.1UE选择Best-M PMI上报的必要性983.5.2.6.3.2PMI频域颗粒度983.5.2.6.3.3PMI的上报周期993.5.2.6.4MU-MIMO下的CQI/PMI上报993.5.2.6.5如何选择配置PUSCH CQI上报的几种模式?1003.5.2.7BF下的CQI/PMI上报1033.5.3R8的局限与进一步演进1053.6CQI估计1063.6.1背景情况1063.6.2方案评估1073.6.2.1影响CQI的因素1073.6.2.2CQI测量方法10

10、83.6.2.3CQI计算1093.6.3结论1103.7TDD上行ACK/NACK反馈模式（bundling and multiplexing）1103.7.1背景情况1103.7.2方案评估1123.7.2.1Bundling的ACK/NACK个数1123.7.2.2Cell-specific / UE-specific Configuration ？1133.7.2.3多ACK/NACK反馈时的传输方式1133.7.2.3.1基本方案1143.7.2.3.1.1Ericsson：DFT-S-OFDM + PUCCH format2（TD-CDM）1143.7.2.3.1.2Motorol

11、a：调制CAZAC序列 + PUCCH format2（FD-CDM）1173.7.2.3.1.3Qualcomm：DFT-S-OFDM + PUCCH format1（TD-CDM）1183.7.2.3.2进一步演进与结论1223.7.2.3.2.1TI：信道选择 + PUCCH format 1b1223.7.2.3.2.2结论1283.7.2.4Bundling与Multiplexing的取舍1293.7.2.5上下行子帧的关系1303.7.2.5.1Ericsson：建立上行子帧与下行子帧关系集合1303.7.2.6上行ACK/NACK资源的确定（CCE to uplink ACK/N

12、AK mapping）1303.7.2.6.1CCE到ACK/NACK映射的基本规则1313.7.2.6.1.1方案1：集中映射1313.7.2.6.1.2方案2A：子帧交织映射1323.7.2.6.1.3方案2B：块交织映射1343.7.2.6.2ACK/NACK资源压缩下的映射规则1353.7.2.6.2.1基本规则：重复映射1353.7.2.6.2.2进一步分析与改进：加入循环移位1373.7.2.6.3进一步演进与结论：基于“块交织”的映射1383.7.2.7下行分配的漏检判断1403.7.2.7.1Ericsson1403.7.2.7.2TI1413.7.2.7.2.1漏检中间一个P

13、DCCH1413.7.2.7.2.2漏检第1个PDCCH1413.7.2.7.2.3漏检最后1个PDCCH1423.7.2.7.2.4多个PDCCH漏检1423.7.2.7.3LG1433.7.2.7.4进一步演进与结论1433.7.2.7.4.1ACK/NACK在PUSCH上的传输1433.7.3R8的局限性与后续可能的演进1453.8上行ACK/NACK Repetition1453.8.1基本描述1453.8.2方案评估1463.8.2.1为什么要引入ACK/NACK Repetition1463.8.2.2ACK/NACK Repetition时占用的PUCCH资源1463.8.2.2

14、.1方案1：重传ACK/NACK与初传ACK/NACK采用相同资源1463.8.2.2.2方案2：重传ACK/NACK资源在初传基础上加一个偏移量1473.8.2.2.3方案3：高层配置固定资源1473.8.2.2.4方案4：使用奇数nCCE值映射资源1483.8.2.2.5结论1493.8.2.3ACK/NACK Repetition Factor的取值1493.8.3R8的局限性与后续可能的演进1493.9上行多TTI调度（Multi-TTI Scheduling）1503.9.1基本描述1503.9.2方案评估1513.9.2.1为什么仅在上行引入多TTI调度，而不在下行引入?1513.

15、9.2.2多TTI调度的窗长取值1513.9.2.2.1窗长为2个子帧1513.9.2.2.2窗长为3个子帧1513.9.2.2.3结论1523.9.3R8的局限与后续可能的改进1533.10上行TTI bundling1543.10.1基本描述1543.10.2方案评估1543.10.2.1为什么引入TTI bundling？1543.10.2.2TTI bundling窗长度与HARQ定时1543.10.2.2.1FDD1543.10.2.2.2TDD1553.10.2.2.2.1为什么TDD bundling仅用于上下行配置0/1/6?1553.10.2.2.2.2TDD bundlin

16、g下的HARQ定时1553.10.2.3TTI bundling对PUSCH上控制信息复用的影响1583.10.3R8的局限与后续可能的改进1593.11其它1593.11.1协议细节问题1593.11.1.1PDCCH相关1593.11.1.1.1为什么去除了限制PDCCH解码的码率门限0.75？1593.11.1.1.2为什么TDD 上下行配置0时在DCI格式0中引入UL index字段？1603.11.1.1.3为什么TDD 上下行配置1-6时在DCI中引入DAI字段？1603.11.1.1.4如何设计PDSCH/PUSCH的TBS表格？1603.11.1.1.5DwPTS如何进行PDC

17、CH和PDSCH传输？1653.11.1.1.6如何区分下行SPS的重传动态调度与常规动态调度？1663.11.1.2CQI相关1663.11.1.2.1为什么引入非周期性的CQI上报？1663.11.1.2.2PUSCH也可以支持宽带CQI上报，为什么却说PUSCH仅支持频率选择性上报？1673.11.1.2.3为什么MIMO模式下CQI定义基于码字而非层？1673.11.1.2.4TDD上下行配置0时，非周期CQI如何上报？1673.11.1.2.5为什么TDD模式下引入更短的CQI上报周期？1683.11.1.2.6为什么FDD cqi-pmi上报周期比TDD多出几个值？1683.11.

18、1.2.7为什么cqi-pmi/ri上报周期没有“OFF”取值？1683.11.1.2.8为什么CQI-only在PUSCH上传输时使用MCS index 29且只采用QPSK？1683.11.1.2.9为什么去除了的最初两个取值（-1dB，0dB）？1683.11.1.3ACK/NACK相关1693.11.1.3.1为什么TDD ACK/NACK Repetition仅适用于bundling模式？1693.11.1.3.2TS 36.213，Table 10.1-1中，为何有些不是按时序关系排列？1693.11.1.3.3Node b如何判断PUSCH上的ACK/NACK是否发送？1693.

19、11.1.3.4为什么ACK/NACK在PUSCH上传输时的MCS offset从13dB扩展到21dB？1703.11.1.4PMI相关1703.11.1.4.1为什么PMI上报时引入码本限制的配置？1703.11.1.4.2为什么OLSM与CLSM传输时有不同的码本限制？1703.11.1.4.3为什么OLSM采用循环使用码本？1714结论以及建议1715附录：Q & A1711 引言1.1 编写目的本文档主要描述LTE自适应技术涉及的技术和相关过程，以深入理解LTE的技术机制，为进一步研究实现算法提供参考。1.2 预期读者和阅读建议本文档适用于算法研究人员、开发人员、测试人员阅读。1.3

20、 参考资料1R1-050816Frequency-domain scheduling with SC-FDMA in E-UTRA ULNokia2R1-050854Adaptive Modulation and Channel Coding Rate Control for Frequency Domain Scheduling in Evolved UTRA DownlinkNTT DoCoMo, Fujitsu, NEC, SHARP3R1-050885Sub-band BW for Frequency Selective Scheduling and CQI FeedbackSamsu

21、ng4R1-050886System Level Performance Comparison between Frequency Scheduling and Time-Frequency Diversity TransmissionSamsung5R1-050942AMC and HARQ Using Frequency Domain Channel-dependent Scheduling in MIMO Channel TransmissionNTT DoCoMo, NEC, SHARP6R1-051041Downlink chunk bandwidth for frequency s

22、elective schedulingSamsung7R1-051055Adaptive Modulation and Coding for Evolved UTRA DownlinkToshiba8R1-051149Adaptive Modulation and Channel Coding Rate Control Method for Frequency Domain Scheduling in Evolved UTRA DownlinkEricsson, Fujitsu, Mitsubishi Electric Corporation, NEC, NTT DoCoMo, Panason

23、ic, Sharp, Toshiba Corporation9R1-051301Link adaptation in EUTRA downlinkLG Electronics10R1-051334CQI Feedback Schemes for EUTRAMotorola11R1-051362OFDMA Based Link Adaptation for Physical Layer in EUTRA Downlink and text proposal for TR 25.814ZTE12R1-051392Link Adaptation Method in Evolved UTRA Upli

24、nkNTT DoCoMo13R1-051415E-UTRA Link adaption: consideration on MIMONokia14R1-060017Link Adaptation for E-UTRA Downlink Text Proposal for TR 25.814Motorola15R1-060018Performance Evaluation of EUTRA Downlink CQI Feedback SchemesMotorola16R1-060039Adaptive Modulation and Channel Coding Rate Control for

25、Single-antenna Transmission with Frequency Domain Scheduling in E-UTRA DownlinkNTT DoCoMo, Fujitsu, Mitsubishi Electric Corporation, NEC, QUALCOMM Europe, Sharp, Toshiba Corporation17R1-060040Adaptive Modulation and Channel Coding Rate Control for MIMO Transmission with Frequency Domain Scheduling i

26、n E-UTRA DownlinkNTT DoCoMo, Fujitsu, Mitsubishi Electric Corporation, NEC, Sharp,18R1-060049Text Proposal on Link Adaptation in E-UTRA UplinkNTT DoCoMo, Fujitsu, NEC, Sharp19R1-060051Link adaptation in E-UTRA downlinkLG Electronics20R1-060073Link Adaptation Considerations for Evolved UTRA DownlinkS

27、amsung21R1-060076Adaptive modulation and channel coding rateSamsung22R1-060101Link Adaptation for E-UTRA DownlinkEricsson23R1-060118Adaptive Modulation and Antenna Selection Procedure for Link Adaptation in OFDMA based E-UTRA DownlinkZTE24R1-060136Relation between chunk-size and CQI signallingSiemen

28、s25R1-060142Further Comparisons between Chunk-Common and Chunk-Dependent Adaptive Modulation using Mutual InformationIntel Corporation26R1-060157Adaptive MIMO transmission mode selection for E-UTRA DLCCL/ITRI27R1-060189E-UTRA DL OFDMA Link AdaptionNokia28R1-060234Downlink AMC processing sequence for

29、 link adaptationHuawei29R1-060261Link Adaptation for E-UTRA Downlink Text Proposal for TR 25.814Ericsson, NTT DoCoMo, Qualcomm, Mitsubishi, LG, Motorola, NEC, Fujitsu, Sharp, Toshiba, Intel30R1-060306Link Adaptation Scheme for Single-antenna Transmission in E-UTRA Downlink NTT DoCoMo, Ericsson, Fuji

30、tsu, Intel, Mitsubishi Electric,31R1-060307Link Adaptation Scheme for MIMO Transmission in E-UTRA DownlinkNTT DoCoMo, Ericsson, Fujitsu, Mitsubishi Electric, NEC,32R1-060324Link Adaptation for E-UTRA UplinkNTT DoCoMo, Ericsson, Fujitsu, NEC, Panasonic, Sharp,Toshiba Corporation33R1-060346Link Adapta

31、tion Considerations for Evolved UTRA Downlink and Text Proposal Samsung34R1-060355Link adaptation for uplink and text proposalSamsung35R1-060381Frequency Domain Scheduling for E-UTRAMotorola36R1-060484TP on Fixed Modulation and RV Sequence with Synchronous HARQ in UplinkQualcomm Europe37R1-060724Lin

32、k Adaptation for E-UTRA UplinkNTT DoCoMo, Ericsson, Fujitsu, NEC, Panasonic, Sharp,Toshiba Corporation, Samsung38R1-060725TP on uplink link adaptationQualcomm Europe39R1-060756Approved Report from RAN1 LTE Ad Hoc MeetingRAN1 Secretary40R1-060787Frequency Domain Channel-Dependent Scheduling with Adap

33、tive Transmission Bandwidth of Pilot Channel for CQI Measurement for E-UTRA UplinkNTT DoCoMo, Fujitsu, Mitsubishi Electric, NEC, Sharp,41R1-060788TP on Fast Transmission Power Control for L1/L2 Control Channel in E-UTRA UplinkNTT DoCoMo, Fujitsu, Mitsubishi Electric, NEC, Sharp,42R1-060794Channel Co

34、ding Structure for LTE downlinkPanasonic43R1-060813Link Adaptation Considerations for Evolved UTRA Downlink and Text ProposalSamsung44R1-060870Text proposal for modulation and power adaptation of MIMO systemsIntel Corporation45R1-060877Frequency Domain Scheduling for E-UTRAMotorola46R1-060911Compari

35、son of CQI feedback schemesMitsubishi Electric47R1-060923Simulation results for uplink fast frequency domain schedulingLG Electronics48R1-060987Link Adaptation Scheme for Single-antenna Transmission in E-UTRA DownlinkNTT DoCoMo, Ericsson, Fujitsu, Mitsubishi Electric, NEC,49R1-060988Link Adaptation

36、Scheme for MIMO Transmission in E-UTRA DownlinkNTT DoCoMo, Ericsson, Fujitsu, Mitsubishi Electric, NEC, Sharp, Toshiba Corporation50R1-061035Mapping to resource blocks in case of multi-stream transmission - text proposalEricsson51R1-061080Text proposal for modulation and power adaptation of MIMO sys

37、temsIntel Corporation52R1-061099Approved Report from RAN1#44 MeetingRAN1 Secretary53R1-061125Text proposal for modulation and power adaptation of MIMO systemsIntel Corporation54R1-061157Simulation results for uplink fast frequency domain schedulingLG Electronics55R1-061158TP on simulation results fo

38、r uplink fast frequency domain schedulingLG Electronics56R1-061196Link Adaptation Scheme for MIMO Transmission in E-UTRA Downlink NTT DoCoMo, Ericsson, Fujitsu, Mitsubishi Electric, NEC, 57R1-061209Evaluation of localized and distributed carrier mappings for EUTRA Downlink MIMO and text proposalFree

39、scale Semiconductor58R1-061215System Level Evaluation of Synchronous and Asynchronous HARQ for Uplink SC-FDMAFreescale Semiconductor59R1-061328Link Adaptation in Evolved UTRA Downlink and TPSamsung60R1-061508System Analysis comparing synchronous and asynchronous adpative HARQ. Qualcomm Europe61R1-06

40、1642Approved Report from RAN1/RAN2 Joint Meeting in AthensMCC Support62R1-061679Group-wised Frequency Resource Allocation for Frequency Domain Channel-dependent Scheduling in SC-Based E-UTRA UplinkNTT DoCoMo, Fujitsu, NEC, Sharp, Toshiba Corporation63R1-061731Overhead Analysis and Resource Assignmen

41、t for Uplink CQI Feedback Channel and TPMotorola64R1-061777DCT based CQI reporting schemeLG Electronics65R1-062104Group-wised Frequency Resource Allocation for Frequency Domain Channel-dependent Scheduling in SC-Based E-UTRA UplinkNTT DoCoMo, Fujitsu, Mitsubishi Electric, NEC, Panasonic, Sharp, 66R1

42、-062133Reduction of Signalling for MIMO PrecodingHuawei67R1-062134Baseline uplink E-CQI message content and sizeHuawei68R1-062278E-UTRA Incremental CQI Reporting Using DCT Coding Ericsson69R1-062416Frequency selective scheduling performance with 30 subcarrier RB size. Motorola70R1-062484Control of C

43、QI feedback signalling in E-UTRAPhilips, Intel71R1-062491Overhead reduction of UL CQI signalling for E-UTRA DLHuawei72R1-062492Baseline uplink E-CQI message content and sizeHuawei73R1-062532Downlink Link Adaptation and Related Control SignalingSamsung74R1-062543Comparison of CQI feedback schemesMits

44、ubishi Electric75R1-062575Further Analysis on DCT based CQI reporting SchemeLG Electronics76R1-062620Benefits of sending two MCS to a user within a TTIMotorola77R1-062665Differential Feedback for MIMO PrecodingIntel Corporation78R1-062701Analysis of support channel overhead for DL MIMOQualcomm Europe79R1-062729Group-wised Frequency Resource Allocation for Frequency Doma in Channel-dependent Scheduling in SC-Based E-UTRA UplinkNTT DoCoMo, Fujitsu, Mitsubishi Electric, NEC, Panasonic, Sharp, Tosh