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An Introduction of 
3GPP Long Term Evolution (LTE) 
Speaker:Tsung-Yin 
Lee
2 
Reference 
 http://www.tcs.com “LTE-Advanced: Future of Mobile Broadband,” 
TATA Consultancy Services 
 Takehiro Naka...
3 
Outline 
 History of 3GPP LTE 
 Basic Concepts of LTE 
 Introduction of LTE Protocol 
 Compare with LTE and LTE-Adv...
4 
What is LTE ? 
 In Nov. 2004, 3GPP began a project to 
define the long-term evolution (LTE) of 
Universal Mobile Telec...
5 
Evolution of Radio Access 
Technologies 
 LTE (3.9G) : 
3GPP release 8~9 
 LTE-Advanced : 
3GPP release 10+ 
802.16d/...
6 
LTE Basic Concepts 
 LTE employs Orthogonal Frequency 
Division Multiple Access (OFDMA) for 
downlink data transmissio...
7 
Multipath-Induced Time Delays Result 
in Inter-Symbol Interference (ISI) 
y(t) = S(t) +bS(t -m) + n(t) 
y(t) : output s...
8 
Equalizers in Receiver 
 Against Frequency Selective Fading 
 Channel transform function Hc(f) 
j fm 
c H ( f ) =1+be...
9 
Frequency Selective Fading 
 the coherence bandwidth of the channel is 
smaller than the bandwidth of the signal 
Freq...
10 
Cyclic Prefixes
11 
FDM vs. OFDM
12 
LTE-Downlink (OFDM) 
 Improved spectral 
efficiency 
 Reduce ISI effect 
by multipath 
 Against frequency 
selectiv...
13 
LTE Uplink (SC-FDMA) 
 SC-FDMA is a new single carrier multiple access 
technique which has similar structure and 
pe...
14 
Multi-antenna techniques
15 
Generic Frame Structure 
 Allocation of physical resource blocks 
(PRBs) is handled by a scheduling function 
at the ...
16 
Resource Grid 
 One frame is 10ms 
 10 subframes 
 One subframe is 1ms 
 2 slots 
 One slot is 0.5ms 
 N resourc...
17 
LTE spectrum (bandwidth and 
duplex) flexibility
18 
LTE Downlink Channels 
Paging Control Channel 
Paging Channel 
Physical Downlink Shared Channel
19 
LTE Uplink Channels 
Random Access Channel 
Physical Radio Access Channel 
Physical Uplink Shared Channel 
CQI report
20 
LTE Release 8 Key Features 
(1/2) 
 High spectral efficiency 
 OFDM in Downlink 
 Single‐Carrier FDMA in Uplink 
 ...
21 
LTE Release 8 Key Features 
(2/2) 
 Compatibility and interworking with earlier 
3GPP Releases 
 FDD and TDD within ...
22 
Evolution of LTE-Advanced 
 Asymmetric transmission bandwidth 
 Layered OFDMA 
 Advanced Multi-cell 
Transmission/R...
23 
Asymmetric transmission 
bandwidth 
 Symmetric transmission 
 voice transmission : UE to UE 
 Asymmetric transmissi...
24 
Layered OFDMA 
 The bandwidth of basic frequency block is, 
15–20 MHz 
 Layered OFDMA radio access scheme in 
LTE-A ...
25 
Advanced Multi-cell 
Transmission/Reception Techniques 
 In LTE-A, the advanced multi-cell 
transmission/reception pr...
26 
Enhanced Multi-antenna 
Transmission Techniques 
 In LTE-A, the MIMO scheme has to be further improved 
in the area o...
27 
Enhanced Techniques to Extend 
Coverage Area 
 Remote Radio Requirements (RREs) using optical 
fiber should be used i...
28 
Support of Larger Bandwidth in 
LTE-Advanced 
 Peak data rates up to 1Gbps are expected 
from bandwidths of 100MHz. O...
29 
LTE vs. LTE-Advanced
30 
Conclusion 
 LTE-A helps in integrating the existing 
networks, new networks, services and 
terminals to suit the esc...
31 
Backup
LTE Downlink Logical Channels 
32
LTE Downlink Logical Channels 
33
34 
LTE Downlink Transport Channel
35 
LTE Downlink Transport Channel
36 
LTE Downlink Physical Channels
37 
LTE Downlink Physical Channels
38 
LTE Uplink Logical Channels
39 
LTE Uplink Transport Channel
40 
LTE Uplink Physical Channels
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An introduction of 3 gpp long term evolution (lte)

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An introduction of 3 gpp long term evolution (lte)

  1. 1. An Introduction of 3GPP Long Term Evolution (LTE) Speaker:Tsung-Yin Lee
  2. 2. 2 Reference  http://www.tcs.com “LTE-Advanced: Future of Mobile Broadband,” TATA Consultancy Services  Takehiro Nakamura ,“Proposal for Candidate Radio Interface Technol ogies for IMT Advanced Bas d on ‐ LTE Release 10 and Beyond,” 3GPP TSG‐RAN Chairman  “3GPP LTE Channels and MAC Layer,” EventHelix.com Inc. 2009  Ahmed Hamza, Network Systems Laboratory Simon Fraser University, “Long Term Evolution (LTE) - A Tutorial,” October 13, 2009  Jim Zyren, “Overview of the 3GPP Long Term Evolution Physical Layer,” Document Number: 3GPP EVOLUTIONWP Rev0 07/2007  David Astély, Erik Dahlman, Anders Furuskär, Ylva Jading, Magnus Lindström, and Stefan Parkvall, Ericsson Research, “LTE: The Evolution of Mobile Broadband” , IEEE Communications Magazine, April 2009
  3. 3. 3 Outline  History of 3GPP LTE  Basic Concepts of LTE  Introduction of LTE Protocol  Compare with LTE and LTE-Advanced  Conclusion
  4. 4. 4 What is LTE ?  In Nov. 2004, 3GPP began a project to define the long-term evolution (LTE) of Universal Mobile Telecommunications System (UMTS) cellular technology  Higher performance  Backwards compatible  Wide application
  5. 5. 5 Evolution of Radio Access Technologies  LTE (3.9G) : 3GPP release 8~9  LTE-Advanced : 3GPP release 10+ 802.16d/e 802.16m
  6. 6. 6 LTE Basic Concepts  LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) for downlink data transmission and Single Carrier FDMA (SC-FDMA) for uplink transmission
  7. 7. 7 Multipath-Induced Time Delays Result in Inter-Symbol Interference (ISI) y(t) = S(t) +bS(t -m) + n(t) y(t) : output signal S(t) : input signal S(t-m) : delayed m time input signal n(t) : noise βS(t-m) y(t) S(t)
  8. 8. 8 Equalizers in Receiver  Against Frequency Selective Fading  Channel transform function Hc(f) j fm c H ( f ) =1+be- 2p  Equalizers transform function Heq(f) (Receiver) ( ) 1 + - H f 1 b 2p j fm = = c H f e c 1 ( ) y(t) = S(t) +bS(t -m)
  9. 9. 9 Frequency Selective Fading  the coherence bandwidth of the channel is smaller than the bandwidth of the signal Frequency Correlation > 0.9 Bc = 1 / 50α α is r.m.s. delay spread It may be useless for increasing transmission power
  10. 10. 10 Cyclic Prefixes
  11. 11. 11 FDM vs. OFDM
  12. 12. 12 LTE-Downlink (OFDM)  Improved spectral efficiency  Reduce ISI effect by multipath  Against frequency selective fading
  13. 13. 13 LTE Uplink (SC-FDMA)  SC-FDMA is a new single carrier multiple access technique which has similar structure and performance to OFDMA A salient advantage of SC-FDMA over OFDM is low to Peak to Average Power Ratio (PAPR) : Increasing battery life
  14. 14. 14 Multi-antenna techniques
  15. 15. 15 Generic Frame Structure  Allocation of physical resource blocks (PRBs) is handled by a scheduling function at the 3GPP base station (eNodeB) Frame 0 and frame 5 (always downlink)
  16. 16. 16 Resource Grid  One frame is 10ms  10 subframes  One subframe is 1ms  2 slots  One slot is 0.5ms  N resource blocks [ 6 < N < 110]  One resource block is 0.5ms and contains 12 subcarriers from each OFDM symbol
  17. 17. 17 LTE spectrum (bandwidth and duplex) flexibility
  18. 18. 18 LTE Downlink Channels Paging Control Channel Paging Channel Physical Downlink Shared Channel
  19. 19. 19 LTE Uplink Channels Random Access Channel Physical Radio Access Channel Physical Uplink Shared Channel CQI report
  20. 20. 20 LTE Release 8 Key Features (1/2)  High spectral efficiency  OFDM in Downlink  Single‐Carrier FDMA in Uplink  Very low latency  Short setup time & Short transfer delay  Short hand over latency and interruption time  Support of variable bandwidth  1.4, 3, 5, 10, 15 and 20 MHz
  21. 21. 21 LTE Release 8 Key Features (2/2)  Compatibility and interworking with earlier 3GPP Releases  FDD and TDD within a single radio access technology  Efficient Multicast/Broadcast
  22. 22. 22 Evolution of LTE-Advanced  Asymmetric transmission bandwidth  Layered OFDMA  Advanced Multi-cell Transmission/Reception Techniques  Enhanced Multi-antenna Transmission Techniques  Support of Larger Bandwidth in LTE-Advanced
  23. 23. 23 Asymmetric transmission bandwidth  Symmetric transmission  voice transmission : UE to UE  Asymmetric transmission  streaming video : the server to the UE (the downlink)
  24. 24. 24 Layered OFDMA  The bandwidth of basic frequency block is, 15–20 MHz  Layered OFDMA radio access scheme in LTE-A will have layered transmission bandwidth, support of layered environments and control signal formats
  25. 25. 25 Advanced Multi-cell Transmission/Reception Techniques  In LTE-A, the advanced multi-cell transmission/reception processes helps in increasing frequency efficiency and cell edge user throughput  Estimation unit  Calculation unit  Determination unit  Feedback unit
  26. 26. 26 Enhanced Multi-antenna Transmission Techniques  In LTE-A, the MIMO scheme has to be further improved in the area of spectrum efficiency, average cell through put and cell edge performances  In LTE-A the antenna configurations of 8x8 in DL and 4x4 in UL are planned
  27. 27. 27 Enhanced Techniques to Extend Coverage Area  Remote Radio Requirements (RREs) using optical fiber should be used in LTE-A as effective technique to extend cell coverage
  28. 28. 28 Support of Larger Bandwidth in LTE-Advanced  Peak data rates up to 1Gbps are expected from bandwidths of 100MHz. OFDM adds additional sub-carrier to increase bandwidth
  29. 29. 29 LTE vs. LTE-Advanced
  30. 30. 30 Conclusion  LTE-A helps in integrating the existing networks, new networks, services and terminals to suit the escalating user demands  LTE-Advanced will be standardized in the 3GPP specification Release 10 (LTE-A) and will be designed to meet the 4G requirements as defined by ITU
  31. 31. 31 Backup
  32. 32. LTE Downlink Logical Channels 32
  33. 33. LTE Downlink Logical Channels 33
  34. 34. 34 LTE Downlink Transport Channel
  35. 35. 35 LTE Downlink Transport Channel
  36. 36. 36 LTE Downlink Physical Channels
  37. 37. 37 LTE Downlink Physical Channels
  38. 38. 38 LTE Uplink Logical Channels
  39. 39. 39 LTE Uplink Transport Channel
  40. 40. 40 LTE Uplink Physical Channels

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