LTE Release 8 Key Features
High spectral efficiency
— OFDM in Downlink, Robust against multipath interference & High affinity to advanced techniques such as Frequency domain channel-dependent scheduling & MIMO 下行OFDM,用频域调度和MIMO什么的增强系统鲁棒性。
— DFTS-OFDM (“Single-Carrier FDMA”) in Uplink, Low PAPR, User orthogonality in frequency domain 上行用SC-FDMA降低系统峰均比什么的。
— Multi-antenna application 多天线
Very low latency
— Short setup time & Short transfer delay 低时延
— Short HO latency and interruption time; Short TTI, RRC procedure, Simple RRC states 低TTI等等
Support of variable bandwidth
— 1.4, 3, 5, 10, 15 and 20 MHz 从1.4MHz到20MHz带宽支持,实际上中移动上来就是20MHz,后期还要上40MHz
Simple protocol architecture
— Shared channel based 信道共享什么的
— PS mode only with VoIP capability 只有分组数据模式,语音走VoIP
Simple Architecture
— eNodeB as the only E-UTRAN node 取消RNC,只留eNodeB
— Smaller number of RAN interfaces, eNodeB « MME/SAE-Gateway (S1), eNodeB « eNodeB (X2) 只有S1和X2两种无线侧接口什么的
Compatibility and inter-working with earlier 3GPP Releases 要能更旧3GPP系统兼容合作
Inter-working with other systems, e.g. cdma2000 能跟其他系统合作比如CDMA2000
FDD and TDD within a single radio access technology 这个是关键
Efficient Multicast/Broadcast 下面不说了
— Single frequency network by OFDM
Support of Self-Organising Network (SON) operation