文档介绍：LTE系统介绍与无线原理
第一章 LTE/SAE 介绍
主要内容
解释E-UTRAN和EPC的背景和结构：
描述蜂窝网的发展；
总结3GPP release从R99到R8的变革；
描述EPS（E-UTRAN和EPC）的逻辑结构；
1、介绍
History
1G FDMA (NMT, AMPS, TACS) 80’s - Voice (analog traffic, digital signaling)
2G TDMA (GSM, D-AMPS, PDC) and CDMA (IS-95) 90’s - Voice, SMS, CS data transfer ~ kbit/s (50 kbit/s HSCSD)
TDMA (GPRS) 00’s - PS data transfer ~ 50 kbit/s TDMA (GPRS+EDGE) 00’s - PS data ~ 500kbit/s
3- WCDMA (UMTS) and CDMA 2000 00’s - PS & CS data transfer ~ 14-84 Mbit/s (HSPA/HSPA+), Voice, SMS
OFDMA (LTE/SAE) 10’s - PS Data and Voice (VoIP) for LTE ~ 300 Mbit/s
4G IMT Advanced
3GPP Evolution
HSPA Evolution
gradually improved performance at a low additional cost prior to the introduction of LTE
LTE
improved performance in a wide range of spectrum allocations
HSUPA MBMS
Rel 6
MIMO
HOM
CPC
Rel 7
Rel 4
R99
HSDPA
Rel 5
Further enhancements
WCDMA/HSPA
WCDMA
HSPA Evolution
Rel 8
LTE
4G
LTE
GSM
LTE is the Global standard for Next Generation – FDD and TDD
CDMA Track (3GPP2)
GSM Track (3GPP)
2001 2005 2008 2010
LTE FDD and TDD
GSM
WCDMA
HSPA
TD-SCDMA
CDMA One
EVDO Rev A
Mobile System Evolution
LTE
- FDD
- TDD
Simplified Network Architecture
CN
SAE CN
RNC
RNC
NodeB
NodeB
e-NodeB
e-NodeB
WCDMA
LTE/SAE
Moving RNC functions to e-NodeB
UE
UE
A flat architecture for optimized performance and cost efficiency
SGSN
GGSN
P/S-GW
MME
LTE – Targets
High data rates
Downlink: >100 Mbps
Uplink: >50 Mbps
Cell-edge data rates 2-3 x HSPA Rel. 6 (@ 2006)
Low delay/latency
User plane RTT: < 10 ms RAN RTT (fewer nodes, shorter TTI)
Channel set-up: < 100 ms idle-to-active (fewer nodes, shorter messages,
quicker node resp.)
High spectral efficiency
Targeting 3 X HSPA Rel. 6 (@ 2006 )
Spectr