Jun Zhang is a visiting assistant professor in the Department of Electronic and Computer Engineering at the Hong Kong University of Science and Technology. He received his B.Eng. in electronic engineering from the University of Science and Technology of China (USTC) in 2004, his M.Phil. in information engineering from the Chinese University of Hong Kong (CUHK) in 2006, and his Ph.D. in electrical and computer engineering from the University of Texas at Austin in 2009. He was an intern at AT&T Labs in the summers of 2007 and 2008.

Jeffrey G. Andrews is an associate professor in the Department of Electrical and Computer Engineering at the University of Texas at Austin, where he is the director of the Wireless Networking and Communications Group. He received his B.S. in engineering with high distinction from Harvey Mudd College, and his M.S. and Ph.D. in electrical engineering from Stanford University. Dr. Andrews has industry experience at companies including Qualcomm, Intel, and Microsoft, and is the co-recipient of three IEEE best paper awards and the National Science Foundation CAREER Award.

Rias Muhamed is a director of business development with the AT&T Corporate Strategy and Development Team. His area of focus is on developing and incubating new business applications and services for AT&T using emerging technologies. He was previously with AT&T Labs, where he led technology assessment of a variety of wireless communication systems. He received his B.S. in electrical engineering from Pondicherry University, India in 1990; his M.S. in electrical engineering from Virginia Tech in 1996; and his M.B.A. from St. Edward University in Austin in 2000.

Chapter 1: Evolution of Cellular Technologies         1

1.1 Introduction   1

1.2 Evolution of Mobile Broadband   3

1.3 The Case for LTE/SAE   23

1.4 Key Enabling Technologies and Features of LTE   28

1.5 LTE Network Architecture   33

1.6 Spectrum Options and Migration Plans for LTE   35

1.7 Future of Mobile Broadband—Beyond LTE   39

1.8 Summary and Conclusions   41

Part I: LTE Tutorials          45

Chapter 2: Wireless Fundamentals          47

2.1 Communication System Building Blocks   47

2.2 The Broadband Wireless Channel: Path Loss and Shadowing   48

2.3 Cellular Systems   56

2.4 The Broadband Wireless Channel: Fading   62

2.5 Modelling Broadband Fading Channels   69

2.6 Mitigation of Narrowband Fading   82

2.7 Mitigation of Broadband Fading   92

2.8 Chapter Summary   94

Chapter 3: Multicarrier Modulation         99

3.1 The Multicarrier Concept   100

3.2 OFDM Basics   103

3.3 OFDM in LTE   109

3.4 Timing and Frequency Synchronization   110

3.5 The Peak-to-Average Ratio   116

3.6 Single-Carrier Frequency Domain Equalization (SC-FDE)   124

3.7 The Computational Complexity Advantage of OFDM and SC-FDE   127

3.8 Chapter Summary   130

Chapter 4: Frequency Domain Multiple Access: OFDMA and SC-FDMA         133

4.1 Multiple Access for OFDM Systems   134

4.2 Orthogonal Frequency Division Multiple Access (OFDMA)   138

4.3 Single-Carrier Frequency Division Multiple Access (SC-FDMA)   142

4.4 Multiuser Diversity and Opportunistic Scheduling   144

4.5 OFDMA and SC-FDMA in LTE   152

4.6 OFDMA System Design Considerations   155

4.7 Chapter Summary   160

Chapter 5: Multiple Antenna Transmission and Reception         167

5.1   Spatial Diversity Overview   168

5.2   Receive Diversity   171

5.3   Transmit Diversity   174

5.4   Interference Cancellation Suppression and Signal Enhancement   186

5.5   Spatial Multiplexing 192

5.6   How to Choose Between Diversity, Interference Suppression, and Spatial Multiplexing   200

5.7   Channel Estimation and Feedback for MIMO and MIMO-OFDM   202

5.8   Practical Issues That Limit MIMO Gains   208

5.9   Multiuser and Networked MIMO Systems   209

5.10 An Overview of MIMO in LTE   213

5.11 Chapter Summary   215

Part II: The LTE Standard 225

Chapter 6: Overview and Channel Structure of LTE         227

6.1 Introduction to LTE   228

6.2 Hierarchical Channel Structure of LTE   234

6.3 Downlink OFDMA Radio Resources   241

6.4 Uplink SC-FDMA Radio Resources   251

6.5 Summary and Conclusions   255

Chapter 7: Downlink Transport Channel Processing         257

7.1 Downlink Transport Channel Processing Overview   257

7.2 Downlink Shared Channels   268

7.3 Downlink Control Channels   276

7.4 Broadcast Channels   283

7.5 Multicast Channels   284

7.6 Downlink Physical Signals   285

7.7 H-ARQ in the Downlink   290

7.8 Summary and Conclusions   293

Chapter 8: Uplink Transport Channel Processing         295

8.1 Uplink Transport Channel Processing Overview   296

8.2 Uplink Shared Channels   298

8.3 Uplink Control Information   301

8.4 Uplink Reference Signals   309

8.5 Random Access Channels   313

8.6 H-ARQ in the Uplink   315

8.7 Summary and Conclusions   317

Chapter 9: Physical Layer Procedures and Scheduling         319

9.1   Hybrid-ARQ Feedback   319

9.2   Channel Quality Indicator (CQI) Feedback   322

9.3   Precoder for Closed-Loop MIMO Operations   333

9.4   Uplink Channel Sounding   337

9.5   Buffer Status Reporting in Uplink   337

9.6   Scheduling and Resource Allocation   339

9.7   Semi-persistent Scheduling for VoIP   344

9.8   Cell Search 346

9.9   Random Access Procedures 348

9.10 Power Control in Uplink 350

9.11 Summary and Conclusions 352

Chapter 10: Data Flow, Radio Resource Management, and Mobility Management         355

10.1 PDCP Overview   359

10.2 MAC/RLC Overview   363

10.3 RRC Overview   369

10.4 Mobility Management   371

10.5 Inter-cell Interference Coordination   377

10.6 Summary and Conclusions   380

Index          383

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