4G网络演进技术与影响.pdf
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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
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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
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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
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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
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