Chapter 13: Retransmission Protocols
Abstract
In NR, multiple retransmission mechanisms are defined—hybrid-ARQ, RLC, and PDCP. 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 and in some occasions such as handover the PDCP protocol. This chapter describes the details of these protocols, as well as explaining why the use of complementing protocols is beneficial.
Keywords
Hybrid-ARQ; Retransmission; Soft combining; RLC; In-sequence delivery; Segmentation; PDCP
Transmissions over wireless channels are subject to errors, for example, due to variations in the received signal quality. To some degree, such ...
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