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3G Evolution, 2nd Edition by Per Beming, Johan Skold, Stefan Parkvall, Erik Dahlman

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Chapter 19. LTE Transmission Procedures

The LTE uplink and downlink transmission schemes have been described from a physical layer perspective in Chapters 16 and 17. In this chapter, some procedures and protocols required for data transmission, for example, retransmission protocols, scheduling, and uplink power control, will be described.

19.1. RLC and Hybrid-ARQ Protocol Operation

In LTE, retransmissions of missing or erroneous data units are handled primarily by the hybrid-ARQ mechanism in the MAC layer, complemented by the retransmission functionality of the RLC protocol. The reasons for having a two-level retransmission structure can be found in the trade-off between fast and reliable feedback of the status reports. The hybrid-ARQ mechanism ...

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