AnIntroductionof3GPPLongTermEvolution(LTE)详解.pptVIP

* LTE Downlink Transport Channel * LTE Downlink Transport Channel * LTE Downlink Physical Channels * LTE Downlink Physical Channels * LTE Uplink Channels Random Access Channel Physical Radio Access Channel Physical Uplink Shared Channel CQI report * LTE Uplink Logical Channels * LTE Uplink Transport Channel * LTE Uplink Physical Channels * LTE Release 8 Key Features (1/2) High?spectral?efficiency OFDM in?Downlink Single‐Carrier?FDMA?in?Uplink Very?low?latency Short?setup?time??Short?transfer?delay Short?hand over?latency?and?interruption?time Support?of?variable?bandwidth 1.4,?3,?5,?10,?15?and?20?MHz * LTE Release 8 Key Features (2/2) Compatibility?and?interworking?with?earlier 3GPP FDD?and?TDD?within?a?single?radio?access technology Efficient?Multicast/Broadcast * Evolution of LTE-Advanced Asymmetric transmission bandwidth Layered OFDMA Advanced Multi-cell Transmission/Reception Techniques Enhanced Multi-antenna Transmission Techniques Support of Larger Bandwidth in LTE-Advanced * Asymmetric Transmission Bandwidth Symmetric transmission Voice transmission: UE to UE Asymmetric transmission Streaming video : the server to the UE (the downlink) * Layered OFDMA The bandwidth of basic frequency block is, 15 - 20 MHz Layered OFDMA comprises layered transmission bandwidth assignment (bandwidth is assigned to match the required data rate), a layered control signaling structure, and support for layered environments for both the downlink and uplink. * Coordinated Multi-Point Transmission/Reception (CoMP) The CoMP is one of the candidate techniques for LTE-Advanced systems to increase the average cell throughput and cell edge user throughput in the both uplink and downlink. * Enhanced Multi-Antenna Transmission Techniques In LTE-A, the MIMO scheme has to be further improved in the area of spectrum efficiency, average cell through put and cell edge performances In LTE-A the antenna configurations of 8x8 in DL and 4x4 in UL are planned * Enhanced Techniques to Extend Cover