Part I. Motivation and Basics: 1. Introduction Patrick Marsch and Gerhard Fettweis; 2. An operator's point of view Ralf Irmer; 3. Information-theoretic basics Patrick Marsch and David Tse; 4. Gains and trade-offs of multi-cell joint signal processing Patrick Marsch; Part II. Practical CoMP Schemes: 5. CoMP schemes based on interference-aware transceivers or interference coordination Lars Thiele, Thomas Wirth, Malte Schellmann, Thomas Haustein, Volker Jungnickel, Philipp Frank, Andreas Mueller, Heinz Droste, Chan-Byoung Chae, Ramya Bhagavatula, Doru Calin and Robert W. Heath, Jr; 6. CoMP schemes based on multi-cell joint signal processing Chenyang Yang, Yafei Tian, Andreas F. Molisch, Xinning Wei, Tobias Weber, Lars Thiele, Thomas Haustein, Volker Jungnickel, Wolfgang Zirwas, Federico Boccardi, David Gesbert and Randa Zakhour; Part III. Challenges Connected to CoMP: 7. Clustering Patrick Marsch, Stefan Brueck, Andrea Garavaglia, Matthias Schulist, Ralf Weber and Armin Dekorsy; 8. Synchronization D. Richard Brown III, Andrew G. Klein, Vincent Kotzsch, Gerhard Fettweis and Malte Schellmann; 9. Channel knowledge Wolfgang Zirwas, Lars Thiele, Tobias Weber, Nico Palleit, Volker Jungnickel, Guido Dietl and Wolfgang Utschick; 10. Efficient and robust algorithm implementation Joerg Holfeld, Gerhard Fettweis, Udo Wachsmann, Rainer Bachl and Stefan Mueller-Weinfurtner; 11. Scheduling, signaling and adaptive usage of CoMP Tarcisio Maciel, Ricardo B. dos Santos, Anja Klein, Christian Hoymann, Laetitia Falconetti, Michael Grieger, Patrick Marsch and Gerhard Fettweis; 12. Backhaul I-Hsiang Wang, David Tse, Christian Hoymann, Laetitia Falconetti, Patrick Marsch, Thorsten Fahldieck and Mark Doll; Part IV. Performance Assessment: 13. Field trial results Uwe Doetsch, Johannes Koppenborg, Patrick Marsch, Michael Grieger, Gerhard Fettweis, Volker Jungnickel, Andreas Forck, Stephan Jaeckel, Sander Wahls, Lars Thiele, Thomas Haustein, Wolfgang Zirwas, Heinz Droste, Gerhard Kadel, Joerg Holfeld, Erik Fischer, Vincent Kotzsch and Hans-Peter Mayer; 14. Performance prediction of CoMP in large cellular systems Thorsten Wild, Andreas Weber, Richard Fritzsche, Jens Voigt, Christian Schneider, Stefan Jaeckel, Carsten Jandura, Laetitia Falconetti, Christian Hoymann, Andreas Mueller, Philipp Frank, Jochen Giese, M. Awais Amin, Stefan Brueck, Mark Doll, Lars Thiele and Michael Olbrich; Part V. Outlook and Conclusions: 15. Outlook Armin Dammann, Christian Mensing, Stephan Sand, Peter Rost, Jens Voigt, Albrecht Fehske, Patrick Marsch and Gerhard Fettweis; 16. Summary and conclusions Patrick Marsch and Gerhard Fettweis.