Data Transmission and Reception

Data transmission and reception is one of the more complex parts of LTE. This chapter begins with an overview of the transmission and reception procedures that are used in the uplink and downlink. It then covers the three main stages of those procedures in turn, namely, the delivery of scheduling messages from the base station, the actual process of data transmission and the delivery of acknowledgements and any associated control information from the receiver. The chapter also covers the transmission of uplink reference signals as well as two associated procedures, power control and discontinuous reception. During the procedure for uplink transmission and reception, the base station sends acknowledgements to the mobiles in the form of hybrid automatic repeat request (ARQ) indicators and transmits them on the physical hybrid ARQ indicator channel.