4G网络演进技术与影响.pdf

4G网络演进技术与影响 移劢网络演进技术特点 FDD-LTE技术介绉 4G网络演进技术对现网的影响 2 第十二部分 FDD-LTE技术和规划及4G演 2011/11/22 进 3GPP-LTE概述 LTE (both radio and core network evolution) is now on the market. Release 8 was frozen in December 2008 and this has been the basis for the first wave of LTE equipment. LTE specifications are very stable, with the added benefit of small enhancements being introduced in Release 9, a Release that will be functionally frozen in December 2009. LTE的演进包括无线网络和核心网络 3 第十二部分 FDD-LTE技术和规划及4G演 2011/11/22 进 3GPP-LTE概述 Motivation for 3GPP Release 8 - The LTE Release Need to ensure the continuity of competitiveness of the 3G system for the future User demand for higher data rates and quality of service Packet Switch optimised system Continued demand for cost reduction (CAPEX and OPEX) Low complexity Avoid unnecessary fragmentation of technologies for paired and unpaired band operation 速率变更高 质量变更好 成本变更低 网络变更简 4 第十二部分 FDD-LTE技术和规划及4G演 2011/11/22 进 3GPP-LTE关键特性 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 — DFTS-OFDM (“Single-Carrier FDMA”) in Uplink, Low PAPR, User orthogonality in frequency domain — Multi-antenna application Very low latency — Short setup time Short transfer delay — Short HO latency and interruption time; Short TTI, RRC procedure, Simple RRC states Support of variable bandwidth — 1.4, 3, 5, 10, 15 and 20 MHz 5 第十二部分 FDD-LTE技术和规划及4G演