In Chapter 15, the LTE radio-interface architecture was discussed with an overview of the functions and characteristics of the different protocol layers. This chapter will provide a more detailed overview of the LTE physical-layer transmission scheme, more specifically, the downlink transmission scheme. Chapter 17 will provide a corresponding overview of the LTE uplink transmission scheme. The following two chapters will then go further into the details of some important LTE access and transmission procedures.
However, before going into the details of the LTE transmission scheme, a brief overview of the overall LTE time-domain structure and the duplex alternatives for LTE will be provided.