LTE自適應(yīng)技術(shù)研究

1、lte自適應(yīng)技術(shù)研究目 錄lte自適應(yīng)技術(shù)研究報(bào)告11引言91.1編寫目的91.2預(yù)期讀者和閱讀建議91.3參考資料91.4縮寫術(shù)語402技術(shù)特征412.1概述412.2基本原理和特點(diǎn)412.2.1自適應(yīng)技術(shù)所需要的信道狀態(tài)信息412.2.1.1基于信噪比均值的信道狀態(tài)信息412.2.1.2基于誤比特率統(tǒng)計(jì)的方法422.2.1.3基于信道矩陣的方法422.2.2典型自適應(yīng)技術(shù)簡介423技術(shù)研究情況433.1鏈路自適應(yīng)433.1.1背景情況433.1.2方案評估433.1.2.1下行433.1.2.1.1rb-dependent還是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方案比較與結(jié)論453.1.2.1.2下行amc與功率分配的聯(lián)合考慮463.1.2.2上行483.1.2.2.1tpc實(shí)現(xiàn)方案493.1.2.2.2amc、atb與tpc的聯(lián)合考慮503.1.3結(jié)論513.2harq513.2.1背景情況513.2.2方案評估523.2.2.1harq實(shí)現(xiàn)方式的確定（同步、異步、自適應(yīng)、非自適應(yīng)）523.2.2.2harq定時(shí)與進(jìn)程數(shù)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定義與取值663.2.2.3.1rv數(shù)目663.2.2.3.2rv順序673.2.2.4星座重排的取舍673.3傳輸模式自適應(yīng)683.3.1基本描述683.3.2方案評估683.3.2.1下行傳輸模式683.3.2.1.1為什么需定義多種傳輸模式，mode 1-7？模式之間如何切換？683.3.2.1.2rach過程下的ue搜索空間與rnti使用693.3.2.1.3c-rnti下，為什么mode 3-7加入了dci格式1a以支持發(fā)射分集？mode內(nèi)部的兩種格式如何進(jìn)行切換？733.3.2.1.4sps c-rnti下，

4、為什么mode 3-6僅支持發(fā)射分集，不支持mimo precoding操作？mode 內(nèi)部的兩種格式如何進(jìn)行切換？753.3.2.1.5sps c-rnti下，為什么mode 7使用dci格式1a時(shí)不采用與c-rnti相同的傳輸方案（即單天線端口0或發(fā)射分集），而采用單天線端口5傳輸？753.3.2.2上行傳輸配置753.3.3r8的局限與后續(xù)可能的演進(jìn)783.4頻域調(diào)度783.4.1背景情況783.4.2方案評估783.4.2.1頻域調(diào)度的增益783.4.2.2頻域的cqi獲取793.4.2.3頻域調(diào)度的策略793.4.3結(jié)論793.5cqi壓縮與反饋方式793.5.1背景情況793.5.

5、2方案評估803.5.2.1基本cqi反饋方案803.5.2.1.1average上報(bào)（即寬帶cqi）803.5.2.1.2band average上報(bào)（即各子帶全上報(bào)）803.5.2.1.3best-m individual上報(bào)（即選擇m個(gè)子帶上報(bào)）803.5.2.1.4best-m average上報(bào)803.5.2.1.5best-m bitmap上報(bào)813.5.2.1.6differential上報(bào)813.5.2.1.7best-m individual+ differential上報(bào)813.5.2.1.8hierarchical structure上報(bào)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進(jìn)一步演進(jìn)與結(jié)論833.5.2.1.12.1cqi表格的設(shè)計(jì)843.5.2.1.12.2set s subbands定義883.5.2.1.12.3為什么引入nompdsch-rs-epre-offset參數(shù)？893.5.2.2wideband feedback893.5.2.2.1為什么不支持pusch上報(bào)模式mode 1-0、mode 1-1？893.5.2.3enode b configured subbands

7、 feedback on pusch893.5.2.3.1為什么引入高層配置的子帶上報(bào)？893.5.2.3.2子帶差分cqi大小893.5.2.3.2.1比特寬度893.5.2.3.2.2差分偏移量取值903.5.2.3.3子帶prb數(shù)目取值903.5.2.3.4為什么去除了上報(bào)模式3-2?903.5.2.4ue-selected subbands feedback on pusch903.5.2.4.1為什么引入ue選擇的子帶上報(bào)？903.5.2.4.2子帶差分cqi大小913.5.2.4.3子帶prb數(shù)目取值913.5.2.4.4m取值913.5.2.4.5best-m子帶標(biāo)簽編號923.

8、5.2.4.5.1組合法923.5.2.4.5.2bitmap法923.5.2.4.5.3單獨(dú)法923.5.2.4.5.4集合法933.5.2.4.5.5結(jié)論953.5.2.4.6為什么去除了pusch上報(bào)模式2-1?953.5.2.5frequency-selective cqi report on pucch953.5.2.5.1子帶cqi上報(bào)方式953.5.2.5.2子帶劃分參數(shù)取值963.5.2.6mimo模式下的cqi反饋和pmi上報(bào)963.5.2.6.1空間差分cqi963.5.2.6.1.1比特寬度963.5.2.6.1.2開環(huán)、閉環(huán)的適用性973.5.2.6.2ri973.5.

9、2.6.2.1ri的上報(bào)周期973.5.2.6.2.2ri的編碼方式983.5.2.6.3pmi983.5.2.6.3.1ue選擇best-m pmi上報(bào)的必要性983.5.2.6.3.2pmi頻域顆粒度983.5.2.6.3.3pmi的上報(bào)周期993.5.2.6.4mu-mimo下的cqi/pmi上報(bào)993.5.2.6.5如何選擇配置pusch cqi上報(bào)的幾種模式?1003.5.2.7bf下的cqi/pmi上報(bào)1033.5.3r8的局限與進(jìn)一步演進(jìn)1053.6cqi估計(jì)1063.6.1背景情況1063.6.2方案評估1073.6.2.1影響cqi的因素1073.6.2.2cqi測量方法10

10、83.6.2.3cqi計(jì)算1093.6.3結(jié)論1103.7tdd上行ack/nack反饋模式（bundling and multiplexing）1103.7.1背景情況1103.7.2方案評估1123.7.2.1bundling的ack/nack個(gè)數(shù)1123.7.2.2cell-specific / ue-specific configuration ？1133.7.2.3多ack/nack反饋時(shí)的傳輸方式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：調(diào)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進(jìn)一步演進(jìn)與結(jié)論1223.7.2.3.2.1ti：信道選擇 + pucch format 1b1223.7.2.3.2.2結(jié)論1283.7.2.4bundling與multiplexing的取舍1293.7.2.5上下行子幀的關(guān)系1303.7.2.5.1ericsson：建立上行子幀與下行子幀關(guān)系集合1303.7.2.6上行ack/nack資源的確定（cce to uplink ack/n

12、ak mapping）1303.7.2.6.1cce到ack/nack映射的基本規(guī)則1313.7.2.6.1.1方案1：集中映射1313.7.2.6.1.2方案2a：子幀交織映射1323.7.2.6.1.3方案2b：塊交織映射1343.7.2.6.2ack/nack資源壓縮下的映射規(guī)則1353.7.2.6.2.1基本規(guī)則：重復(fù)映射1353.7.2.6.2.2進(jìn)一步分析與改進(jìn)：加入循環(huán)移位1373.7.2.6.3進(jìn)一步演進(jìn)與結(jié)論：基于“塊交織”的映射1383.7.2.7下行分配的漏檢判斷1403.7.2.7.1ericsson1403.7.2.7.2ti1413.7.2.7.2.1漏檢中間一個(gè)p

13、dcch1413.7.2.7.2.2漏檢第1個(gè)pdcch1413.7.2.7.2.3漏檢最后1個(gè)pdcch1423.7.2.7.2.4多個(gè)pdcch漏檢1423.7.2.7.3lg1433.7.2.7.4進(jìn)一步演進(jìn)與結(jié)論1433.7.2.7.4.1ack/nack在pusch上的傳輸1433.7.3r8的局限性與后續(xù)可能的演進(jìn)1453.8上行ack/nack repetition1453.8.1基本描述1453.8.2方案評估1463.8.2.1為什么要引入ack/nack repetition1463.8.2.2ack/nack repetition時(shí)占用的pucch資源1463.8.2.2

14、.1方案1：重傳ack/nack與初傳ack/nack采用相同資源1463.8.2.2.2方案2：重傳ack/nack資源在初傳基礎(chǔ)上加一個(gè)偏移量1473.8.2.2.3方案3：高層配置固定資源1473.8.2.2.4方案4：使用奇數(shù)ncce值映射資源1483.8.2.2.5結(jié)論1493.8.2.3ack/nack repetition factor的取值1493.8.3r8的局限性與后續(xù)可能的演進(jìn)1493.9上行多tti調(diào)度（multi-tti scheduling）1503.9.1基本描述1503.9.2方案評估1513.9.2.1為什么僅在上行引入多tti調(diào)度，而不在下行引入?1513.

15、9.2.2多tti調(diào)度的窗長取值1513.9.2.2.1窗長為2個(gè)子幀1513.9.2.2.2窗長為3個(gè)子幀1513.9.2.2.3結(jié)論1523.9.3r8的局限與后續(xù)可能的改進(jìn)1533.10上行tti bundling1543.10.1基本描述1543.10.2方案評估1543.10.2.1為什么引入tti bundling？1543.10.2.2tti bundling窗長度與harq定時(shí)1543.10.2.2.1fdd1543.10.2.2.2tdd1553.10.2.2.2.1為什么tdd bundling僅用于上下行配置0/1/6?1553.10.2.2.2.2tdd bundlin

16、g下的harq定時(shí)1553.10.2.3tti bundling對pusch上控制信息復(fù)用的影響1583.10.3r8的局限與后續(xù)可能的改進(jìn)1593.11其它1593.11.1協(xié)議細(xì)節(jié)問題1593.11.1.1pdcch相關(guān)1593.11.1.1.1為什么去除了限制pdcch解碼的碼率門限0.75？1593.11.1.1.2為什么tdd 上下行配置0時(shí)在dci格式0中引入ul index字段？1603.11.1.1.3為什么tdd 上下行配置1-6時(shí)在dci中引入dai字段？1603.11.1.1.4如何設(shè)計(jì)pdsch/pusch的tbs表格？1603.11.1.1.5dwpts如何進(jìn)行pdc

17、ch和pdsch傳輸？1653.11.1.1.6如何區(qū)分下行sps的重傳動(dòng)態(tài)調(diào)度與常規(guī)動(dòng)態(tài)調(diào)度？1663.11.1.2cqi相關(guān)1663.11.1.2.1為什么引入非周期性的cqi上報(bào)？1663.11.1.2.2pusch也可以支持寬帶cqi上報(bào)，為什么卻說pusch僅支持頻率選擇性上報(bào)？1673.11.1.2.3為什么mimo模式下cqi定義基于碼字而非層？1673.11.1.2.4tdd上下行配置0時(shí)，非周期cqi如何上報(bào)？1673.11.1.2.5為什么tdd模式下引入更短的cqi上報(bào)周期？1683.11.1.2.6為什么fdd cqi-pmi上報(bào)周期比tdd多出幾個(gè)值？1683.11.

18、1.2.7為什么cqi-pmi/ri上報(bào)周期沒有“off”取值？1683.11.1.2.8為什么cqi-only在pusch上傳輸時(shí)使用mcs index 29且只采用qpsk？1683.11.1.2.9為什么去除了的最初兩個(gè)取值（-1db，0db）？1683.11.1.3ack/nack相關(guān)1693.11.1.3.1為什么tdd ack/nack repetition僅適用于bundling模式？1693.11.1.3.2ts 36.213，table 10.1-1中，為何有些不是按時(shí)序關(guān)系排列？1693.11.1.3.3node b如何判斷pusch上的ack/nack是否發(fā)送？1693.

19、11.1.3.4為什么ack/nack在pusch上傳輸時(shí)的mcs offset從13db擴(kuò)展到21db？1703.11.1.4pmi相關(guān)1703.11.1.4.1為什么pmi上報(bào)時(shí)引入碼本限制的配置？1703.11.1.4.2為什么olsm與clsm傳輸時(shí)有不同的碼本限制？1703.11.1.4.3為什么olsm采用循環(huán)使用碼本？1714結(jié)論以及建議1715附錄：q & a1711 引言1.1 編寫目的本文檔主要描述lte自適應(yīng)技術(shù)涉及的技術(shù)和相關(guān)過程，以深入理解lte的技術(shù)機(jī)制，為進(jìn)一步研究實(shí)現(xiàn)算法提供參考。1.2 預(yù)期讀者和閱讀建議本文檔適用于算法研究人員、開發(fā)人員、測試人員閱讀

20、。1.3 參考資料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 feedbacks

21、amsung4r1-050886system 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 frequen

22、cy 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, pan

23、asonic, 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

24、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

25、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 scheduli

26、ng 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 downl

27、inksamsung21r1-060076adaptive 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 signallingsi

28、emens25r1-060142further 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

29、 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,

30、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 ad

31、aptation 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 europe37r1-06072

32、4link 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

33、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,42r1-060794channe

34、l 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-utramotorola46r1-060911com

35、parison 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 adaptat

36、ion 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

37、 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 result

38、s 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 proposal

39、freescale 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 europe61r

40、1-061642approved 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 assig

41、nment 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,

42、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

43、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 schemes

44、mitsubishi 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 e

45、urope79r1-062729group-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-channe

46、l 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 transm

47、ission 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 adapt

48、ationericsson88r1-062873e-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 inf

49、ormation 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 reportingipwireless95r1-06

50、2954further 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 feedba

51、ck 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 compr

52、essed 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 bet

53、ween 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 for ltenokia114r1-063437switching between s