LTE介绍(诺基亚西门子内部培训资料)
合集下载
相关主题
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Improve Terminal Power Efficiency
09/2006 close of the study item & approval of work
ຫໍສະໝຸດ Baidu
plan
Frequency Allocation Flexibility with 1.25/2.5, 5, 10,
15 and 20 MHz Allocations
LTE in 3GPP Release 8
3GPP and Operator Requirements
Study Phase
Packet Switched Domain Optimized
2004: 3GPP workshop on UTRAN Long Term
Server-UE RTT <30 ms
push wireless capabilities
For internal use
4
© Nokia Siemens Networks
Charles / 2009-05-05
HSDPA data
volume
HSDPA data packages
introduced traffic explodes
Drivers for LTE
Wireline evolution pushes higher data
rates Wireless data usage
requires more capacity
Flat rate pricing pushes efficiency Other technologies
For internal use
2
© Nokia Siemens Networks
Charles / 2009-05-05
LTE motivation and background
For internal use
3
© Nokia Siemens Networks
Charles / 2009-05-05
Access
Core
GSM/EDGE/ UMTS/HSPA
Shift of functionality
LTE Overview
Sun Changsong LBTS I&V HZ 2009-05-05
For internal use
1
© Nokia Siemens Networks
Charles / 2009-05-05
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
DL: OFDMA UL: SC-FDMA
64QAM Modulation
TX
RX
MIMO
Tx Channel Rx
Advanced Scheduling Time & Freq. (Frequency
Selective Scheduling)
Short TTI = 1 ms Transmission time
8
© Nokia Siemens Networks
Charles / 2009-05-05
LTE Architecture
For internal use
9
© Nokia Siemens Networks
Charles / 2009-05-05
Our Key Architectural Concept Flat and Cost effective Mobile Network
• Major PHY updates.
12/2008 baseline
• Major MAC updates.
03/2009 baseline
• Major L3 updates. ASN.1 for RRC.
For internal use
6
© Nokia Siemens Networks
Charles / 2009-05-05
interval
HARQ: Hybrid
Automatic Repeat Request
1
2
NACK
ACK
1
Combined 2 decoding Rx Buffer
Channel only changes amplitude and phase of subcarriers
For internal use
LTE Key Technology
For internal use
7
© Nokia Siemens Networks
Charles / 2009-05-05
The Beauties of LTE
Fast Link Adaptation
due to channel behaviour
scalable
Evolution
Access Delay <300 ms
03/2005 Start of the study
Peak Rates UL/DL 50/100 Mbps
12/2005 Multiple Access selected
Good Mobility and Security
03/2006 eNB/Core functional split selected
Release 8 Stage 3 Output
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
Several customers with >3 TB/day HSDPA traffic
LTE expectations
Elisa Flat rate 10-30 €/month
3GPP schedule
For internal use
5
© Nokia Siemens Networks
Charles / 2009-05-05