《Differential Analysis on of TDLTE and LTE FDD.ppt》由会员分享，可在线阅读，更多相关《Differential Analysis on of TDLTE and LTE FDD.ppt（25页珍藏版）》请在三一办公上搜索。
1、Differential Analysis on of TD-LTE and LTE FDD,TD-LTE System,HAO Dandan,Outline,Executive Summary of Differential AnalysisKey Differential AnalysisAlgorithm AnalysisRequirements for next step CooperationNote:This PPT is based on the version of 3GPP Rel.8 36 series released in Dec.2008.,Executive Sum
2、mary of Differential Analysis for Physical Layer,Physical Layer Differential Analysis,Physical Layer Differential Analysis,Physical Layer Differential Analysis,Physical Layer Differential Analysis,Physical Layer Differential Analysis,MAC/RLC/PDCP/RRC/NAS,Key Differential Analysis,Outline,Frame struc
3、tureCell SearchRandom AccessHARQSpecial SubframeFrequency Band,Key Differential Analysis Frame Structure,Frame structureFrame structure type 1-FDDFrame structure type 2 TDDTD-LTE frame structure can flexible configured,and can align with TD-SCDMA system.So the TD-SCDMA and TD-LTE can co-exist at sam
4、e position.,Key Differential Analysis Frame Structure,High impact on Phy software:7 Frame structures X 9 special subframes=63 Frame configurations for TD-LTEvs.1 for FDD(normal cyclic prefix)Control of special subframesSwitching from DL to UL(min.GP given by TA)Different rate matching Control of sub
5、framesDL or UL onlySwitching from UL to DL within a gap ofminimum timing advance TAoffs=20 msGuard Period(GP)between DL and ULStandard timing advance(TA)mechanism used,8DL+DwPTS:1UL,TA+TAoffs,GP,Frame structures,Key Differential Analysis Cell Search,Cell SearchThe position of P-SCH and S-SCH is diff
6、erent for FDD and TDD,The AGC and AFC control and adjustment procedure should be different for FDD and TDD,Key Differential Analysis-PRACH,Random AccessPreamble format 4 is for frame structure type 2 only,UpPTS can be used to sending preamble.Preamble mapping in time and frequency is different for f
7、rame structure type 1 and type 2For frame structure type 2,there might be multiple random access resources in an UL subframe.,Release buffer,Release buffer,Discard,Key Differential Analysis-HARQ,8 HARQ buffers and 8 processes for FDD,up to 15 processes specified for TD-LTE(config 5)Implementation of
8、 TD-LTE specific ACK/NACK timing UL HARQVarying number of PHICH groups in a frame(config 0)Extension of DCI formats on PDCCHImplementation of TD-LTE bit-fields in DCI formats,4,5,6,7,8,9,10,11,12,13,14,15,1,2,3,Process#:,5,Keep buffer,Take next buffer,3,Take next buffer,5,Keep buffer,Take next buffe
9、r,9,Take next buffer,14,11,2,1,3,2,4,5,6,7,8,6,2,7,8,10,12,15,NACK,ACK,#,HARQ Buffer occupied by process#,Nobuffer,3,-,-,2xPHICH,1xPHICH,Frame configuration 0,Key Differential Analysis-HARQ,According to 3GPP TS 36.213:The number of HARQ processes is determined by the DL/UL configuration.Upon detecti
10、on of a PDCCH with DCI format 0 and/or a PHICH transmission in subframe n intended for the UE,the UE shall:Adjust the corresponding PUSCH transmission in subframe n+k,with k3 according to the PDCCH and PHICH informationTransmit the ACK/NACK response in UL subframe n+k,with k3,(if ACK/NACK is provide
11、d)The use of a single ACK/NACK response for providing HARQ feedback for multiple PDSCH transmissions is supported by performing logical AND of all the corresponding individual PDSCH transmission ACK/NACKs.,n+k,k=8,n+k,k=7,n+k,k=6,n+k,k=4,bundling,Key Differential Analysis ACK/NACK,ACK/NACKs of multi
12、ple DL subframes in one UL subframeBundling(AND of ACKs)for PUCCH/PUSCHMultiple ACK/NACKs combined to single ACK/NACK Reuse of existing PUCCH formatsMultiplexing(multiple ACKs)for PUCCH/PUSCHMultiple ACK/NACKs combined over MIMO code wordsReuse of existing PUCCH formats by using multiple PUCCH resou
13、rcesHandle missed DL assignments(DAI)Combinations with CQI,SR,SRSDef:PUCCH=Physical UL control channelDef:PUSCH=Physical UL shared channel,Key Differential AnalysisACK/NACK encoding and timing,UL ACK/NACK for DL HARQBundling and multiplexing for PUCCHDetermination and selection of PUCCH resource ind
14、ex,n+k,k=8,n+k,k=7,n+k,k=6,n+k,k=4,bundling,Key Differential Analysis Special Subframe,Normal CP14 symbols/subframe,Extended CP12 symbols/subframe,3:10:1,3:8:1,9:4:1,10:3:1,11:2:1,12:1:1,3:9:2,9:3:2,10:2:2,11:1:2,8:3:1,9:2:1,10:1:1,3:7:2,8:2:2,9:1:2,DwPTS,UpPTS,Key Differential Analysis Special Subf
15、rame,DwPTS/UpPTSDwPTSPCFICH、PDCCH、PHICH、PDSCH and P-SCHP-SCH is located at third symbol of DwPTSAt last two symbol for downlink controlUpPTSSounding RSPRACH,Key Differential Analysis UE specific reference signals,Extraction and control of dedicated pilotsChannel estimation fordiscontinuous DLFast channel estimator settling(kick start function)New time domain filtering parameters for UL to DL switch pointsNew frequency domain filtering parameters,Frequency Band Characteristics FDD,Frequency Band Characteristics TDD,THANK YOU,
