LTE自适应技术研究.doc

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-dependent 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 harq563.2.2.2.2.1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，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793.5.2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-contiguous 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 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923.5.2.4.5.1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973.5.2.6.2ri973.5.2.6.2.1ri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1083.6.2.3cqi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）1143.7.2.3.1.2motorola：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/nak 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pdcch1413.7.2.7.2.2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1463.8.2.2.1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?1513.9.2.2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 bundling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pdcch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？1683.11.1.2.7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？1693.11.1.3.4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 & a171 第 6 页 共 170 页1 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 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 feedbacksamsung4r1-050886system 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 selective 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, panasonic, 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 uplinkntt 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 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 in 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 downlinksamsung21r1-060076adaptive 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 signallingsiemens25r1-060142further 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 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, fujitsu, 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 adaptation 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 europe37r1-060724link 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 adaptive 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 coding 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-utramotorola46r1-060911comparison 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 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 systemsintel 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 for 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 proposalfreescale 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 europe61r1-061642approved 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 assignment 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, 66r1-062133reduction 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 cqi 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 schemesmitsubishi 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, toshiba corporation80r1-062749further results on the impact of speed: feedback period: and sub-channel bandwidth on the performance of downlink closed loop schemes for 4-branch ltenortel81r1-062750further performance evaluation for dl adaptive mimo nortel82r1-062772compressed cqi reporting schemenec group83r1-062796uplink transmit diversity scheme to provide full csi to support downlink mimo transmission for tdd operationcatt84r1-062808evaluation and error statistics for cqi reporting schemespanasonic85r1-062809e-utra downlink system level performance with compressed cqi feedbackpanasonic86r1-062842cqi design and its impact of dl performancenokia87r1-062865physical layer aspects of link adaptationericsson88r1-062873e-utra incremental cqi reporting using dct codingericsson89r1-062904frequency domain adaptive precoding for e-utra mimomotorola90r1-062905additional results on frequency-domain adaptive precoding for eutra mimomotorola91r1-062906uplink sounding for obtaining channel state information at node b in eutramotorola92r1-062907direct channel feedback for obtaining channel state information at node b in eutramotorola93r1-062908mobile assisted sounding feedback for multi antenna system for eutramotorola94r1-062917overhead for periodic and triggered cqi reportingipwireless95r1-062954further analysis on dct based cqi reporting schemelg electronics96r1-062962overhead for periodic and triggered cqi reportingipwireless97r1-063029control of cqi feedback signalling in e-utraphilips98r1-063086overhead reduction of best-m based cqi reportinghuawei99r1-063094comparison of cqi feedback schemesmitsubishi electric100r1-063142physical layer aspects of link adaptationericsson101r1-063174analysis on dct based cqi reporting scheme lg electronics102r1-063184evaluation and error statistics for cqi reporting schemespanasonic103r1-063185e-utra downlink system level performance with compressed cqi feedbackpanasonic104r1-063186multiplexing and link adaptation of downlink l1/l2 control signalingpanasonic105r1-063204compressed cqi reporting schemenec group106r1-063237ue feedback mechanisms to support single user and multi-user mimotexas instruments107r1-063260dynamic mode switching between single and multi-user mimo with fine granularity mcs levelssamsung108r1-063262ue feedback and scheduling considerations for 4-tx antenna mimosamsung109r1-063268cqi reporting for e-utrasamsung110r1-063270downlink link adaptation and related control signalingsamsung111r1-063310downlink mimo scheme for shared data channel in e-utrantt docomo, fujitsu, institute for infocomm research, 112r1-063379power control email discussion summarynokia113r1-063383evaluation method for benchmarking cqi schemes