LTE基础知识.pptx

Why LTE?
LTE & 3GPP Standard
UMTS work
UMTS LTE Air Interface
Call proceeding
移动通信行业的发展趋势
手机用户将超越电脑用户成为互联网上最大的用户群
移动通信行业的发展趋势
移动数据业务将呈爆炸性的增长,移动网络承受巨大压力
移动互联网发展驱动新一轮移动通信技术变革
CDMA
OFDMA
TDMA
WCDMA
HSPA
LTE-
Advanced
(包括
目前,形成了LTE FDD、TD-LTE、WiMAX竞争的新格局
LTE-FDD
•峰值速率
35/75Mbps
•小区吞吐量

TD-LTE
•峰值速率
28/84Mbps
•小区吞吐量

EV-DO Rel. 0 D0 Rel. A
•峰值速率

•小区吞吐量

•峰值速率:
•小区吞吐量:
TD-SCDMA TD-HSPA
•峰值速率:
•小区吞吐量:
TD-LTE Ad)
•峰值速率
500Mbps~1Gbps
Mobile WiMAX

•峰值速率
33/75Mbps

•峰值速率
500Mbps~1Gbps
2G

GPRS/EDGE
3G

4G
cdma2000
1x
3GPP2阵营
(CDMA)
WiMAX阵营
•峰值速率

•小区吞吐量

3GPP阵营(GSM)
5 | 3GPP LTE Technology - Overview| June 2006
Innovative Technologies Emerging in Standards
mercial launches
2008
2007
Beyond
2006
2009
3G LTE
All-IP
OFDM
MIMO
AAS
WiMAX
All-IP
OFDM
MIMO
WiMAX -2005
All-IP
OFDM
MIMO
AAS
AAS
CDMA2000 EV-DO
IP transport
EV-DO
All-IP
OFDM
MIMO
AAS
HSDPA / HSUPA
IP Transport
HSPA+
MIMO
All-IP
OFDM, All-IP, MIMO & AAS
are the key cornerstones of new & future wireless standards
7 | 3GPP LTE Technology - Overview| June 2006
Increased Performances & Reduced Costs with LTE
Latency
Throughput
Cost per Megabyte*
* Source: Analysis Research, 2006
Mobility
Roaming
LTE
EDGE
HSPA
UMTS
384kbps DL
128kbps UL
Mb/s DL
UL
€
€
220kbps DL
120ms
60ms
750ms
H/O with
GSM
€
>100 Mb/s DL
>50 Mb/s UL
<10ms
H/O with
GSM,UMTS,
CDMA…
8 | 3GPP LTE Technology - Overview| June 2006
3GPP Requirements For LTE
Spectrum efficiency
DL : 3-4 times HSDPA for MIMO(2,2)
UL : 2-3 times E-DCH for MIMO(1,2)
Frequency Spectrum :
Scalable bandwidth : , 3, 5, 10, 15, 20MHz
To cover all frequencies of IMT-2000: 450 MHz to GHz
Peak data rate (scaling linearly with the spectrum allocation)
DL : > 100Mb/s for 20MHz