LTE介绍诺基亚西门子内部培训资料

Study Phase
Packet Switched Domain Optimized
2004: 3GPP workshop on UTRAN Long Term
Server-UE RTT <30 ms
Evolution
Access Delay <300 ms
03/2005 Start of the study
LTE expectations
Elisa Flat rate 10-30 €/month
3GPP schedule
For internal use
4
© Nokia Siemens Networks
Charles / 2009-05-05
LTE in 3GPP Release 8
3GPP and Operator Requirements
Charles / 2009-05-05
LTE Architecture
For internal use
8
© Nokia Siemens Networks
Charles / 2009-05-05
Our Key Architectural Concept Flat and Cost effective Mobile Network
Access
Core
Control
GSM/EDGE/ UMTS/HSPA
Shift of functionality
2G
BTS
BSC
W-CDMA BTS RNC
MGW
SGSN
GGSN
MGW
LTE / SAE
LTE BTS (eNodeB)
MME SAE-GW
• From CS to PS domain (VoIP), split of functions between eNodeB & aGW • Interworking, smooth migration, service continuity and investment protection
For internal use
1
© Nokia Siemens Networks
Charles / 2009-05-05
LTE motivation and background
For internal use
2
© Nokia Siemens Networks
Charles / 2009-05-05
For internal use
3
© Nokia Siemens Networks
Charles / 2009-05-05
HSDPA data
volume
HSDPA data packages
introduced traffic explodes
Several customers with >3 TB/day HSDPA traffic
Outline
• LTE motivation and background • 3GPP schedule • LTE Key Technology • LTE architecture • LTE physical Layer • LTE layer 2/3 • LTE Peak Bit Rates • Spectral Efficiency • Voice evolution in LTE/SAE • Nokia Siemens Networks LTE
Automatic Repeat Request
1
2
NACK
ACK
1
Combined 2 decoding Rx Buffer
Channel only changes amplitude and phase of subcarriers
For internal use
7
© Nokia Siemens Networks
12/2008 baseline
• Major MAC updates.
03/2009 baseline
• Major L3 updates. ASN.1 for RRC.
For internal use
5
© Nokia Siemens Networks
Charles / 2009-05-05
LTE Key Technology
09/2006 close of the study item & approval of work
plan
Frequency Allocation Flexibilityபைடு நூலகம்with 1.25/2.5, 5, 10,
15 and 20 MHz Allocations
Release 8 Stage 3 Output
For internal use
6
© Nokia Siemens Networks
Charles / 2009-05-05
The Beauties of LTE
Fast Link Adaptation
due to channel behaviour
scalable
DL: OFDMA UL: SC-FDMA
Drivers for LTE
Wireline evolution pushes higher data rates
Wireless data usage requires more capacity
Flat rate pricing pushes efficiency
Other technologies push wireless capabilities
WCDMA evolution work to continue
06/2008 baseline
3-4 times higher capacity expected than with
09/2008 baseline
Release 6 HSDPA/HSUPA reference case
• Major PHY updates.
64QAM Modulation
TX
RX
MIMO
Tx Channel Rx
Advanced Scheduling Time & Freq. (Frequency
Selective Scheduling)
Short TTI = 1 ms Transmission time
interval
HARQ: Hybrid
Peak Rates UL/DL 50/100 Mbps
12/2005 Multiple Access selected
Good Mobility and Security
03/2006 eNB/Core functional split selected
Improve Terminal Power Efficiency