e future, mobile network operators (MNOs) will have to provide broad- band data rates to an increasing number of users with lowest cost per bit and prob- ably as flat rates as known from fixed network providers. Intercell interference is the most limiting factor in current cellular radio networks, which means that any type of practical, feasible interference mitigation will be of highest importance to tackle the expected 100-fold traffic challenge. As the only means actually known to over- come interference, cooperation is therefore a very likely candidate for integration into an enhanced LTE system. In early 2008, a study item was launched at 3GPP searching for useful enhancements of LTE release 8, which might end in a new LTE release R9. In parallel, there are strong global activities for the definition of the successor of IMT2000, so-called IMT Advanced systems, where it is likely that some form of cooperation will be included. Accordingly, research on cooperative antenna systems has become one of the hottest topics, and it will form the input of ongoing standardization activities. In IEEE 802.16j, the relaying task group defines mobile multihop relay (MMR) solutions for WiMAX systems; meanwhile, coop- erative relaying has been adopted as one type of relaying. © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3GPP LTE Radio and Cellular Technology Chapter 7 ("Cooperative Transmission Schemes") introduces different coop- erative antenna (COOPA) concepts like intra- and inter-NB cooperation and distributed antenna systems (DASs) based on remote radio heads (RRHs) or as self-organizing networks, addressing different aspects of the previously mentioned issues. This chapter is organized into five sections: The second section provides a basic analysis of cooperative antenna systems, the third classifies the basic types of cooperation systems, the fourth is concerned with implementation issues, and the fifth concludes the chapter. The motivation for cooperation, theoretical analysis, and simulation results i